Although the town's name is Mesen, the battle is known under its French version of Messines. This is because the Flemish town had been given this name on international maps. In Dutch, the battle is also known as "the Second Battle of Messines" or "the Mine Battle".
In a large-scale operation, the allied forces had dug a network of underground corridors under German positions on the nearby ridge. Explosives were placed and detonated on 7 June to take the Germans by surprise. This created 19 large craters, one of which is still visible at present: the pool of peace in Messines. The battle was a milestone in the Great War.
7 June marks several commemorations, by Britain, Ireland, Australia and New Zealand. Williams and Kate will follow a ceremony at the Irish Peace Monument, at 2PM in the afternoon. The rest of their schedule has not been announced for safety reasons.