The Waterloo campaign commenced with a pre-emptive attack by the French Army of the North under the command of Napoleon Bonaparte. The first elements of the Army of the North moved from their peacetime depots on 8 June to their rendezvous point just on the French side of the Franco-Belgian border. They launched a pre-emptive attack on the two Coalition armies that were cantoned in Belgium—the Anglo-allied army under the command of the Duke of Wellington, and a Prussian army under the command of Prince Blücher.