On the 2nd August Britain assured the German Ambassador that Britain would not go to war with Germany unless they invaded Belgium or used the English Channel to attack France
On 3rd August news reached London of German troops massing at the Belgium border
The Prime Minister gave in to increasing pressure and ordered Winston Churchill to mobilise the Royal Navy and Richard Haldane to prepare the British Army for war
On 4th August Britain sent its own ultimatum to Germany
It demanded that Germany withdraw their troops or Britain would declare war
Germany ignored the demand and Britain declared war that same day