On Sunday 2 August anti-war demonstrations were held across Britain, organised by the ILP:
"With a spontaneity which was a striking proof of how surely rooted in principle was the organisation, every section of it [the ILP] moved in the same way. The National Council, the Divisional Councils, the Federations, the branches—even the smallest and most isolated of these— acted as by a common impulse; and on Sunday, August 2nd, in every city, town and village where there was a branch or group of the Independent Labour Party, a public protest against the nation being dragged into the war was made, and a demand that whatever might happen in Europe, this country should stand neutral and play the part of peacemaker." 
The demonstration in Trafalgar Square, London, was described by the Manchester Guardian as "the biggest held for years." Speakers included John Stokes (Chairman of the London Trades Council), , George Lansbury (Daily Herald editor and former socialist MP); Robert Williams (Secretary of the Transport Workers’ Federation), Will Thorne MP ( British Socialist Party), Mary Macarthur (Federation of Women Workers), Margaret Bondfield (Shop Assistants’ Union), Dr. Marion Phillips (Women’s Labour League), Herbert Burrows (British Socialist Party), Keir Hardie (ILP), Arthur Henderson ( Labour Party) Charlotte Despard and Robert Cunninghame Graham (former MP for Northwest Lanarkshire, and future founding president of the Scottish National Party).
Robert Cunningham Graham said: "Do not let us do this crime, or be parties to the misery of millions who have never done us harm."
A manifesto had already been signed by Keir Hardie and Arthur Henderson on behalf of the British section of the International Socialist Bureau, saying:
"Workers, stand together therefore for peace. Combine and conquer the militarist enemy and the self-seeking Imperialists to-day once and for all."