On the morning of August 4th (1914), I walked with Ottoline up and down the empty streets behind the British Museum, where now there are University buildings. We discussed the future in gloomy terms. When we spoke to others of the evils we foresaw, they thought us mad; yet it turned out that we were twittering optimists compared to the truth. ...
The first days of the War were to me utterly amazing. My best friends, such as the Whiteheads, were savagely warlike.
Source: The Autobiography of Bertrand Russell, v.2, 1968, chapt.1: The First World War.
More info.; https://russell-j.com/beginner/AB21-030.HTM