How did Pittsburgh Landing fit into the Northern strategy in fighting the war?

Pittsburg Landing fit into the Northern strategy in fighting the war by the  Union wanting to gain control of the tributaries that flowed into the Mississippi River.

Hope this answers the question. Have a nice day.

a phrase from a poem by ralph waldo emerson about the battle of lexington and concord. emerson's words read, “here once the embattled farmers stood / and fired the shot heard round the world.”