loki100 wrote:Not sure, how many instances were there in the period up to 1914 of declared offensive alliances?
Isn't this, to all intents and purposes, what the British and French did in the Crimean War (oh, and Sardinia-Piedmont, I believe)? Sure, it was coming to the aid of the beleaguered Ottomans, but they undertook a joint invasion of the Crimea.
Then there's the Prussians and Austrians ganging up on Denmark over Schleswig-Holstein in 1864, possibly the French and British in Egypt (when they established the Condominium), the multi-national response to the Boxer Rebellion, and the First and Second Balkans Wars against/with the Ottomans. Those are the ones I can think of that seem to me to have been offensive in nature, even if they might not have been touted as offensive alliance wars.