Pierre Mischel enlisted at the organization of the Battery in 1861 and was mustered out at its disbandment in 1865 at the end of the Civil War. There is a brief summary of the operations were the 2nd artillery was involved[2]: Early in the outbreak of the rebellion, Captain Ernest Herzberg of Milwaukee, tendered to the Governor the services of the "Washington Artillery Company," of that city. When Governor Kandall received authority to raise five batteries, the tender of Captain Herzberg was accepted, and he was instructed to fill up his company to 150 men. This was done, and the company went into rendezvous at Camp Utley, Racine, and was mustered into the United States service on the 10th of October, 1861.

They left the State for Baltimore, Md., on the 21st of January, 1862. Arriving there on the 24th, they were sent forward to Fortress Monroe, where the battery was stationed as part of the garrison, until September, when they moved to Camp Hamilton, near Hampton, where it was engaged in garrison duty until the 10th of January, 1863. They then moved to Suffolk, where five pieces of the battery took part in the battle of South Mary's Bridge, on the 30th of January. During the greater portion of 1863, the battery was stationed at different points on the Peninsula, in the neighborhood of Yorktown. On the 20th of January, 1864, they embarked at Yorktown, and proceeded to Point Lookout, Md., where they engaged as guard to the rebel prisoners at that place. In January, 1864, forty-eight of the battery reenlisted as veterans, and proceeded to Wisconsin on furlough.  The Second Battery remained at Point Lookout until mustered out of service.

No trace of Pierre Mischel before 1900 when a Peter Meichel, servant in the house of Jno Lutz, Fredonia Ozaukee Co. stated being born Belgium, 63 y.o., single, having emigrated to the States in 1855.

He was admitted in the Soldiers' Home in 1907 for "old age" but was dropped, awol, in July 1909.  He stated living in Port Washington, a laborer 72 y.o. He was nevertheless buried in the Home Cemetery on April 17, 1914 (block 19 n° 290). A note says: "body brought to morgue of Hospital - same day - from outside the Home. His pension card note that his death occurred in Campbellsport (between Port Washington and Fond du Lac).