Model 1822 Musket
They had totally disappeared from the Army of the Potomac by the second half of 1862 ( aside from the Irish Brigade , which carried Model 1842 muskets until 1864 ) , but the less-well equipped Confederates used them for longer , and the Army of Northern Virginia's ordnance chief claimed that Gettysburg was the first battle in which the army was completely free of smoothbore muskets . In the West , the situation was worse for both sides and smoothbores remained in use in the Union armies into 1863 . 
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