With the dominoes starting to fall, it remained unclear what position Britain would take. The German Kaiser was inclined to believe that Britain would look to her interests first and foremost and remain above the fray - after all, she had no obvious quarrel with either Austria-Hungary or Germany, at least in this matter. Nevertheless, Britain was practically committed to France's defence; and the French went to some lengths to ingratiate themselves with the British during July. Yet the British government was aware that in order to enter the war a better reason than vague commitments to France would be necessary in order to convince British public opinion. In the event Britain's guarantee to maintain Belgian neutrality - agreed at the 1839 Treaty of London - served its purpose. Although there was much disagreement within the British political elite concerning war, it was this guarantee that brought Britain into the war on 4 August.