pitched battle vs Ypres

pitched battle and Ypres both are nouns.

Word	Noun	Adjective	Verb	Adverb
pitched battle	Yes	No	No	No
Ypres	Yes	No	No	No

pitched battle (noun)	Ypres (noun)
a fierce battle fought in close combat between troops in predetermined positions at a chosen time and place	battle in World War I (1914); heavy but indecisive fighting as the Allies and the Germans both tried to break through the lines of the others
	battle in World War I (1915); Germans wanted to try chlorine (a toxic yellow gas) as a weapon and succeeded in taking considerable territory from the Allied salient
	battle in World War I (1917); an Allied offensive which eventually failed because tanks bogged down in the waterlogged soil of Flanders; Germans introduced mustard gas which interfered with the Allied artillery