The Burden of Neutrality
All nations want peace, but they want a peace that suits them – Admiral Fisher
The Dutch had remained steadfastly neutral through the war so far, despite provocations by both sides. However, the entry of the USA into the war affected their position; they could no longer act as a conduit for goods between any pro-German merchant in the USA and Germany itself. There were still other sources for such trade, as nominally they still had access to world markets, but with America now in the war, the British immediately acted to raise the intensity of inspections on Dutch shipping. Any suspiciously large quantities of food, fuel or raw materials were stopped, unless it could be proven that they were not destined for Germany. British Intelligence had not been idle in the Netherlands, and goods for ‘blacklisted’ Dutch firms were usually confiscated, although financial compensation was offered.
In short order, the leak in the blockade was sealed.
After the American declaration of war, the Dutch government therefore felt vulnerable. Their entire trade with the world and their colonies in the Indies was subject to Allied goodwill, while commerce on the continent offered declining possibilities, as the German economy visibly suffered the effects of both war and blockade.
It had always been prudent for the Dutch to ignore any minor abuses of their territory or neutrality. With respect to the Allies, that argument had now become much stronger, and that was a vital factor in the events of mid-July.
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In the early hours of the 17th July, destroyers of the Dover Patrol took up positions to support Motor Launches laying smoke floats. Further offshore, the battlecruisers New Zealand, Invincible and Indefatigable opened fire, supported by the new 15” Monitors Roberts and Erebus and a dozen smaller vessels that could approach the coast.
The bombardments were cover for four converted Naval Defence Act cruisers, a set of hastily requisitioned passenger ferries and small steamers and a hoard of Motor Launches and Coastal Motor Boats. The cruiser HMS Iphigenia led the attack, approaching the end of the huge, curved Mole at Zeebrugge along a course that had been marked moments earlier by two CMBs dropping calcium flares.
Originally built as a dock for cargo ships and as a defence against the ever-changing sandbanks off the Belgian coast, the Germans had fortified the Mole in 1915, placing six 4.1” or 3.4” guns along the extended wave-break at the end. Three 5.9” guns were mounted on the end of the Mole itself, dominating the harbour and the coastline to the east.
Masked by thick Brock smoke until she was very close in, Iphigenia’s approach avoided the arcs of fire of most of these guns until the last minute, but as she rounded the end of the Mole she came directly under the barrels of the 5.9” guns. Her two small pom-pom cannons and two of her remaining 6” had been in action since she emerged from the smoke, but now at a range of no more than 150 yards she let loose her most dreadful weapons; a pair of high-powered flamethrowers that drenched the 5.9” guns and the Mole extension positions in fire in just a few seconds. Charges exploded in the heat, as men hurled themselves in the sea to escape the flames. The heavy German batteries on the coast took some time to understand that Iphegenia was a threat, and she was able to move along the Mole, burning the sheds that housed a garrison of over 500 German troops.
For the British, the plan’s timing was holding up well; just as the threat from the Mole guns was largely eliminated, a converted Irish Sea ferry approached the seaward side of the Mole and deployed a series of gangways onto the parapet at the top, allowing 400 Royal Marines to charge onto the Mole and advance to suppress any remaining guns and secure the vast concrete dock against the inevitable German counterattack.
Meanwhile, the other converted cruisers emerged from the smoke and headed into the lee of the Mole and the entrance to the ship canal leading to Bruges, while other steamers went for the entrance to the Leopold Canal a mile or so further east. By now, the Germans were fully on alert and the later ships entered to a blaze of gunfire from the shore, to which they responded with everything from heavy machine-guns to their remaining 6”. Despite the German fire, six ships made it to either the canal entrances or the breakwaters that protected them and disgorged their cargo of nearly 4,000 Marines and Infantrymen. The Thetis was not so lucky, as she was wrecked by 21-cm shells from the Goeben battery during her approach and was beached just a hundred yards offshore. She was an obvious target for every German gunner, and casualties among her crew and the landing party she carried soon became horrific.
Nevertheless, with support from ships offshore, the British and a token contingent of Belgian troops pushed towards the town and spread out to try to take German batteries from the rear. Some of these assaults succeeded and others did not, leaving several heavy German guns still operational as the first wave of reinforcements arrived at dawn.
Covered by fire from Monitors and destroyers, a wave of larger X-lighters and more conventional light craft came into the beaches and breakwaters. The German defences had yet to be fully overcome, and the wire entanglements in the dunes and around the bunkers prevented many of these men from moving inshore. However, the weight of numbers told, and the German positions were cut off. By midday, many had run out of ammunition, and all were filled with wounded, exhausted men. During the afternoon, the surviving batteries began to fall or to surrender, allowing the Allied troops to begin to push inland.
By the evening, the coast inshore of the Mole and half the town of Zeebrugge were in British hands.
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A few miles further east, another battle had begun at 4.20am as the USS South Carolina, the Michigan and nine pre-dreadnoughts of the 3rd Battle Squadron opened fire with their 9.2” and 12” guns. The Royal Marine landings they covered were intended to knock out the Knokke batteries of 15” and 11” guns and to secure the flank of the Zeebrugge beachhead. The eastern flank of the Knokke landings themselves was secured by the boarder with neutral Holland.
With no mole and limited possibilities for outflanking the batteries from behind, it had to be a near-head-on beach assault. The first wave included a series of landing vessels armed with mortar-like projectors, each firing a shell laden with explosives, Phosgene or a new agent; Mustard Gas, which would be carried inshore by the prevailing winds.
Despite the ferocity of the attack, the troops soon became bogged down in the German beach defences, where wire and the surviving machine-gunners took as heavy a toll as they would anywhere on the Western Front. The effects of gas hindered both sides, and only a few of the fortified heavy gun positions were taken or disabled before dawn. Further attacks during the day produced few results, and losses grew as reinforcements were more easily targeted by the surviving German guns while the slow-moving lighters approached the beaches.
Having fired more than 4,000 heavy shells overnight, the 3rd Battle Squadron returned to Britain and was replaced by four older ships as dawn broke. During the morning, the battleship HMS Glory suffered an explosion after coming under accurate fire from 11” or 12” shells. She sank in under five minutes, with the loss of 558 of her crew. Later in the day the London had to withdraw, heavily on fire, while other vessels of the bombardment force also suffered damage.
Nevertheless, the German defenders were already tired after a day on alert and a night in battle, and they became increasingly occupied in their own defence as the day wore on. They were unable to interfere with the action taking place at Zeebrugge, while a smaller Allied attack elsewhere meant that no reinforcements would reach Knokke that day. By the evening, the last batteries were running low on ammunition and were effectively besieged.
Despite heavy losses during the assault, the British had another toehold on the Belgian coast.