 A survey conducted in 1603 recorded that Upnor Castle had 20 guns of various calibres, plus another 11 guns split between two sconces or outworks, known as Bay and Warham Sconces.The castle's armament consisted of a demi-cannon, 7 culverin, 5 demi-culverin, a minion, a falconet, a saker, and four fowlers with two chambers each.Bay Sconce was armed with 4 demi-culverin, while Warham Sconce had 2 culverin and 5 demi-culverin.