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Operation Crusader?

Something tells me its from Irish Rebellion of 1798.
Maybe battle of Antrim?

correct- though i cant give you rep atm (gave you not long ago it seems- could someone rep him for me, please?)
your turn

hopefully rather easy one but not too easy
http://imgc.allpostersimages.com/images/P-473-488-90/46/4612/9BJFG00Z/posters/robert-hunt-third-battle-of-the-aisne-1918.jpg

wild guess, but siege of Harfleur? because if i recall correctly, that was prelude to battle of Agincourt and if it is Henry V campaign in France during 100 years war, it would make sense it would be...