The second battle for this city marked the first widespread use of poison gas during World War I.
A remembrance "league" named for this city was patronized by Princess Beatrice, whose son, Prince Maurice of Battenberg, was killed in a battle for it. Fighting at St. Julien and Kitcheners' Wood occurred around this city in the first battles in which a Canadian force defeated a European power. The goal of the Lys offensive was the capture of this city, which was the location of the final battle of the Race to the (*) Sea as trenches were dug in 1914. The third battle named for this city is also named for a town five miles to its east called Passchendaele. The second battle for this city marked the first widespread use of poison gas during World War I. For 10 points, name this Belgian city that the British nicknamed "Wipers."
A remembrance "league" named for this city was patronized by Princess Beatrice, whose son, Prince Maurice of Battenberg, was killed in a battle for it.
{Ypres} [(EEpr); or {Ieper;} accept {Wipers} before \"Wipers\"]