Battlecruiser Squadron 1 was a tacitcal unit of the Grayson Space Navy's Protector's Own Squadron. In 1919 PD it was commanded by Rear Admiral Cynthia Gonsalves. In 1919 PD Battlecruiser Squadron 1 was part of the Protector's Own task force sent to the Sidemore Station, Marsh System to assist Admiral Honor Harrington. It took part in the Second Battle of Marsh, when the Second Havenite-Manticoran War begun. (HH10)