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Wool bunting pennant flag. White field with a wide blue border around all three sides. In the center of the flag is a green shield. On the shield, a white anchor is diagonally crossed with a red cannon (the cannon surmounts the anchor). White or undyed hoist with no grommets. Inscription on hoist reads "9 ARMY CORPS 4 DIV 3 BRIG HORSTMANN, / PHILADELPHIA".
Ninth Army Corps (22 July 1862 - 1 August 1865)
The Ninth Army Corps used several different flags during its existence between 22 July 1862 and 1 August 1865. The corps badge, authorized on April 19, 1864, called for the design of a shield on which a fouled anchor lies beneath a cannon. the regulation flag bearing the badge design came into use in the late summer of 1864.
The Corps was commanded by Major General Ambrose Burnside from its beginning. It is speculated that the shield represents the seal of the state of Rhode Island, General Burnsides' birthplace, and the fouled anchor refers to the Corp's participation in the Peninsular campaign.