Surprised this wasn't mentioned yet.
The battle of Vimy Ridge started on April 9th, 1917
This was the battle where the Canadian Corps fought as a purely Canadian Unit under the command of a Canadian General Arthur Currie.
Currie was considered a bit of a maverick and an innovator at the time and he bought those to bear on the Germans.
He utilized not only overwhelming artillary on narrow corridors but used creeping artillary to allow his men to effectively close on the enemy.
Among the other innovations, he was the first one to try counter battery artillery to silence enemy guns. He also trained all non commissioned officers to know the duties and rolls of their more senior NCM's and officers so they could take command if those officers were killed or wounded. This meant that Canadian Units were less likely to panic, break down or flee under fire.
Most importantly he also felt that the best way to counter murderous machine gun fire and entrenched enemy troops was to find a way to get his troops as close as possible to the enemy.
In the days leading up to the battle, the Canadians secretly tunneled and trenched so that they would be positioned as close to the enemy as possible, at the same time Currie used his artillery to smash the enemies fixed artillery.
at 5:30 am on April 9th, the Canadians attacked, they opened with a massive artillery barrage, 30,000 Canadians then came out of their trenches and tunnels and walked behind a solid wall of artillary which allowed the Canadians to walk right up the enemy position. The Germans were caught un prepared and most were in their shelters when the Canadians hit the trenches. By 12:30 pm the battle was effectively over and the Canadian Corp had taken the Ridge. out of over 10,000 Canadian Casualties 3,598 Canadians were killed.
