Also referred to as "all played out" or "played out". It was the motto adopted in 1862 in the Union Army of the Potomac, expressing their weariness of a war that their generals were badly managing. A popular song among the troops went: "Abram Lincoln, what yer 'bout?/Hurrah! Hurrah!/ Stop this war. It's all played out./ Hurrah! Hurrah!"
From "The Language of the Civil War" John D. Wright page 7.