here, even when France knew she was about to be invaded by the Germans, the French were very worried that the English would not join in the fight against Germany:
Following their refusal to remain neutral in a war between Germany and Russia, French leaders knew it was only a matter of time before Germany declared war on France too. Now it was all-important to get Britain to take their side, as promised (informally) in military staff talks and slightly less ambiguous Anglo-French Naval Convention. But many members of the British cabinet were unaware of these secret agreements and understandably reluctant to embroil Britain in a cataclysmic continental war.
On hearing word of the German invasion of neutral Luxembourg, whose neutrality was agreed in the Treaty of London of 1867, the French ambassador to London, Paul Cambon, asked Foreign Secretary Edward Grey whether Britain would fight. However Grey pointed out that, unlike the 1838 treaty guaranteeing Belgian neutrality, the 1867 treaty didn’t technically oblige Britain to take military action to protect to Luxembourg’s neutrality, if the other Great Powers weren’t also intervening. Cambon could barely contain his anger at this slippery reasoning, according to H. Wickham Steed, the foreign editor of The Times, who recalled, “he pointed to a copy of the Luxemburg Treaty… and exclaimed bitterly: ‘There is the signature of England… I do not know whether this evening the word “honor” will not have to be struck out of the British vocabulary.’”
But Grey was merely representing the views of the British cabinet; personally, he had staked everything on British intervention, threatening to resign if the cabinet insisted on neutrality and working with First Lord of the Admiralty Winston Churchill to drum up support from the opposition Unionists. Unionist support gave Grey and Prime Minister Asquith crucial political leverage, as they might be able to form a new coalition government without the anti-interventionists.
On August 2, Asquith went into the 11am cabinet meeting with a letter pledging Unionist support, and now the tide began to turn: although a handful of ministers resigned in protest, the rest of the cabinet agreed to at least protect the French coastline from German naval attacks, as promised in the naval convention of 1912. However, the deciding factor would be Germany’s violation of Belgian neutrality.