Belgium was beginning to collapse.
Not in one clean catastrophe, nor with some single decisive battle that broke the kingdom in an afternoon, but town by town and road by road as the German armies continued westward. Liège had fallen behind them, its fortress hills reduced to broken concrete, cratered earth and burial grounds. The name itself was already becoming something refugees whispered to one another when they heard aircraft overhead or engines approaching from the east.
Across the countryside, civilians fled before the grey advance. Carts laden with bedding and food crowded the western roads while families abandoned villages sometimes hours before the first German patrol appeared. Fields stood untended beneath the July sun, grain moving gently in the wind while cattle wandered behind fences whose owners had already gone. Rumour travelled faster than any army. Stories of aircraft cutting men apart in trenches, tanks crushing wire and artillery burying forts beneath their own concrete grew more terrible with every telling until many Belgians no longer imagined the Germans as ordinary soldiers at all.
They imagined a machine.
And through the emptiness left behind, the First, Second and Third German Armies continued west.
Motorcycles and armoured reconnaissance vehicles still probed ahead, but behind them came the real weight: infantry, artillery, tanks, supply columns and endless trains carrying ammunition toward the front. Belgian detachments fought wherever commanders could gather enough men to make another stand, holding crossroads, villages, forests and bridges for an hour or perhaps half a day before overwhelming firepower forced them backward again.
The grey tide kept moving.
Luxembourg had already disappeared behind it. The Grand Duchy still possessed its crown and government, but German troops controlled its roads and railways, and German flags now flew above positions that only days earlier had belonged entirely to Luxembourg. What had once been a neutral country had become another artery through which men and matériel flowed toward France.
Yet Germany was not advancing into an empty continent.
Across the Channel, Britain was beginning to arrive.
The first elements of the British Expeditionary Force were already stepping ashore at French ports, boots striking docks at Boulogne and Le Havre while officers shouted orders beneath clouds of steam and coal smoke. Horses were led carefully down ramps. Artillery followed. Rifles, ammunition boxes, wagons and everything required to move a professional army across another country accumulated along the quays.
Many of the men still smiled.
Some waved at French civilians gathering to watch them. Others joked with comrades, posed for photographs or promised one another that the war would be finished before winter. They were trained soldiers rather than frightened conscripts, yet even professional experience could not prepare them for something that had never existed before.
Few understood what Germany had become.
Farther inland, the French Army was moving as well. The Fifth Army marched toward Belgium, its columns stretching along the roads of northern France beneath a bright summer sky. Cavalry moved ahead while infantry followed through clouds of pale dust, blue coats and red trousers still lending the formations something almost ceremonial when viewed from a distance.
Elsewhere, the rest of France had already begun carrying out the great offensive logic of Plan XVII. French formations pressed eastward toward Alsace and Lorraine, driven not merely by military planning but by memories nearly half a century old. Sedan, Metz, Strasbourg and the provinces lost in 1871 still lived within the national imagination. While the Fifth Army moved north to meet the German threat through Belgium, other French armies turned toward the frontier believing that the road to victory still led east.
Soon artillery would answer artillery there as well.
But above the Fifth Army, the first warning came from the sky.
French reconnaissance aircraft droned ahead of the marching columns, fragile machines of canvas, timber and wire searching the northern horizon for German movement. Their pilots expected to observe roads, perhaps photograph concentrations and return with reports. Aeroplanes were still scouts in the minds of many men below.
Then several shapes appeared high above them.
At first the French assumed they were friendly.
Four narrow monoplanes emerged from the clouds, metallic bodies glinting briefly beneath the sun as they descended with astonishing speed. Then someone saw the black crosses.
The German fighters came down like steel hawks.
Machine guns opened before the French pilots fully understood what was happening. Canvas ripped apart beneath concentrated fire. One reconnaissance machine rolled sharply as its pilot slumped forward, then began spiralling toward the earth. Another burst into flame when rounds found its fuel, the burning aircraft breaking apart as it fell.
The remaining French machines tried to turn away, but they were too slow.
Within moments the sky belonged to Germany.
Below, thousands of men had stopped marching to stare upward. Cavalry horses tossed their heads nervously while officers shouted for formations to keep moving.
Then the German fighters rolled over and came down again. This time they were not hunting aircraft.
A cavalry column disappeared beneath the first strafing pass. Machine-gun fire moved along the road in a line of dust, blood and collapsing horses. Animals screamed and fell across one another, throwing riders beneath hooves while men farther back scattered into the ditches.
"Germans!"
The cry moved through the column.
"The Germans are coming!"
Rifles rose instinctively toward the sky. Men fired almost vertically, working bolts as quickly as they could while officers screamed at them to spread out.
The fighters passed over the cavalry and continued toward the infantry beyond.
Another burst tore through marching ranks before the men could disperse. Soldiers folded into the road. One man's pack burst open under fire, clothing and equipment scattering behind him as he fell. Another was struck across the shoulder and neck, blood spraying the men beside him before all three threw themselves into the ditch.
Then the aircraft were gone.
They climbed sharply toward the clouds, regrouped and disappeared northward almost as quickly as they had arrived.
The entire attack had lasted minutes.
The effect remained much longer.
France had just received its first intimate lesson in the kind of war Belgium had already been fighting for a week.
The German aircraft had not destroyed the Fifth Army. They had scarcely slowed it, but they had done something more useful.
They had introduced fear.
And as the Western Front began taking shape beneath artillery smoke, marching armies and aircraft moving overhead, another war was already unfolding far beyond the reach of those guns.
The war at sea.
Its opening had been quieter.
To understand it, one had to go back almost two weeks, to a time when armies had not yet crossed Belgium and Britain had not yet formally entered the conflict.
On the evening of 9 July, while Oskar's latest speech was still being repeated through Germany and translated for foreign newspapers, the Imperial Navy had already begun moving.
Tirpitz and Prince Heinrich understood something armies could afford to forget.
A division could board trains and reach a frontier within days. A fleet could not simply appear thousands of kilometres away because war had been declared.
Capital ships required fuel, ammunition, provisions and carefully prepared routes. Submarines needed patrol sectors and support arrangements. Minelayers needed assigned waters. Cruisers sent into distant seas might require days merely to reach the positions from which they could become useful.
If Germany waited for Britain to declare war before repositioning its navy, Britain would receive the first move.
And at sea, the first move could become a cage.
British naval power did not depend merely upon possessing more battleships than anyone else. Britain was an island empire connected to much of its wealth by water. Grain crossed oceans to reach British ports. Raw materials came from colonies and foreign markets. Merchant ships linked the Home Islands with Canada, India, Africa, Australia and the Americas. Fishing fleets fed coastal communities, while commercial shipping carried the fuel, food and industrial materials upon which the British economy depended.
Control the sea, and Britain could reach the world.
Lose that control, and the same sea became a wall.
German planners knew what Britain intended to do to them. A blockade did not need to destroy the High Seas Fleet in battle. Britain could simply close the major approaches, intercept German shipping, isolate overseas possessions and slowly tighten economic pressure around the Reich.
Tirpitz had no intention of waiting inside Wilhelmshaven until the Royal Navy completed the noose.
So Germany moved before Britain had entered the war.
Under cover of ordinary fleet movements, exercises and the growing confusion of the European crisis, ships began leaving their bases during the nights of 9 and 10 July. Radio traffic was deliberately restricted. Orders travelled sealed. Crews knew they were deploying, but many were told little about where the operation would ultimately carry them.
Prince Heinrich concentrated upon the Baltic.
Cruisers, destroyers, minelayers and older capital ships moved toward positions from which they could contain the Russian Baltic Fleet. Minefields were laid across likely approaches. Patrol lines formed outside Russian waters. Merchant vessels suspected of supporting the Russian war effort were stopped or seized where circumstances allowed, while German warships began threatening the trade and fishing upon which Russia's Baltic coast depended.
The objective was not to conquer the Baltic.
It was to make Russian use of it dangerous.
Prince Heinrich would hold Russia behind mines, patrols and the threat of German guns.
Tirpitz looked west.
Submarines began leaving their protected pens and disappearing beneath the North Sea. Some took positions around likely British approaches and shipping lanes. Others moved farther outward, toward patrol sectors from which they could eventually threaten Atlantic commerce if Britain entered the war.
But Tirpitz did not rely upon submarines alone.
He committed six modern battlecruisers. Three formed the newer Moltke group—SMS Moltke, Goeben and Seydlitz—while three more were older Blücher-type vessels.
They were heavy ships by the standards of any navy, yet fast enough to outrun the great battleship formations capable of destroying them in a stand-up fight. They had not been sent west to seek glory in some grand fleet engagement, however. Their purpose was far simpler.
Commerce war.
The six vessels did not sail from German waters in one magnificent column advertising their destination to every observer along the coast. They departed separately, regrouped only where necessary and maintained strict wireless discipline while working northward through the North Sea.
The British Grand Fleet remained the great danger.
Scapa Flow sat in the north like the closed fist of the Royal Navy. Once Britain entered the war, any German formation caught between the Grand Fleet and the approaches to Germany risked being trapped against the coast.
The English Channel was worse, for soon it would become a narrow throat of patrols, mines and destroyers through which no German battlecruiser commander with a functioning mind would willingly attempt to force six capital ships.
There was only one practical route. Which was going north, around Scotland. Then west into the Atlantic.
Germany wanted its raiders beyond Britain's principal naval cordon before Britain possessed the legal reason to stop them.
Once there, distance itself would provide protection.
The Atlantic was too large for any fleet to watch completely. There was no operational radar capable of finding a ship over the horizon. Oskar's research laboratories had experimented with detection technologies, but none was reliable enough to change naval warfare yet.
The ocean still belonged to eyes.
Lookouts stared through binoculars until their vision blurred. Smoke against the horizon might reveal a merchantman tens of kilometres away. Wireless operators listened through static for careless transmissions. Light cruisers spread outward from the battlecruisers, searching enormous areas of empty sea while destroyers guarded closer approaches.
Whoever saw first possessed the advantage.
And thus, by the time Britain declared war on Germany on 15 July, Tirpitz's gamble had already succeeded. The raiders were out. Britain could close the North Sea behind them, but the ships already beyond that gate could not simply be called back into existence.
The formal order reached the Atlantic forces on the morning of the 16th. Beneath a low ceiling of fog, Vice Admiral von Spee stood aboard the flagship of the Second Battlecruiser Squadron while Moltke, Goeben and Seydlitz spread across the surrounding waters with their supporting cruisers and destroyers. A wireless message was brought to the bridge. Spee read it once, folded it and looked toward his signal officer.
"Britain has entered the war. Inform the squadron that free hunting is authorized. Report any enemy warships immediately."
The order travelled outward. Farther north, Hipper and his three Blücher-class battlecruisers received much the same message. Neither squadron had been sent to challenge the Grand Fleet in some glorious battle. Their task was commerce war: find the shipping that carried food, fuel, men and raw materials across the seas and make the Atlantic dangerous for anyone supplying Germany's enemies.
The formations spread wider.
Beyond the horizon, British merchantmen continued steaming toward home from America, Africa, India and the wider Empire. French and Russian shipping crossed the same ocean, crews going about their work with little idea that six German battlecruisers were already searching the Atlantic approaches for their smoke.
Yet the great grey ships were only the hunters that could be seen.
Beneath the water, others were moving.
German U-boats were slipping toward their assigned patrol grounds, some watching the approaches to Britain and the Channel, others pushing farther into the Atlantic. They travelled patiently, surfacing when circumstances allowed and disappearing again beneath the waves, unseen by the merchantmen passing somewhere beyond their periscopes.
The surface raiders cast their nets across the sea. Below them, the sharks were already hunting.
And their prey did not yet know they were there.