In early November, Allied intelligence learned that the Japanese were preparing again to try to retake Henderson Field. Therefore, the U.S. sent Task Force 67, a large reinforcement and resupply convoy carrying Marine replacements, two U.S. Army infantry battalions, and ammunition and food, commanded by Turner, to Guadalcanal on 11 November. The supply ships were protected by two task groups, commanded by Rear Admirals Daniel J. Callaghan and Norman Scott, and aircraft from Henderson Field. The ships were attacked several times on 11 and 12 November by Japanese aircraft from Rabaul staging through an air base at Buin, Bougainville, but most were unloaded without serious damage.U.S. reconnaissance aircraft spotted the approach of Abe's bombardment force and passed a warning to the Allied command. Thus warned, Turner detached all usable combat ships under Callaghan to protect the troops ashore from the expected Japanese naval attack and troop landing and ordered the supply ships at Guadalcanal to depart by early evening 12 November. Callaghan's force comprised two heavy cruisers, three light cruisers, and eight destroyers.Around 01:30 on 13 November, Callaghan's force intercepted Abe's bombardment group between Guadalcanal and Savo Island. In addition to the two battleships, Abe's force included one light cruiser and 11 destroyers. In the pitch darkness, the two warship forces intermingled before opening fire at unusually close quarters. In the resulting mêlée, Abe's warships sank or severely damaged all but one cruiser and one destroyer in Callaghan's force and both Callaghan and Scott were killed. Two Japanese destroyers were sunk and another destroyer and the Hiei heavily damaged. Despite his defeat of Callaghan's force, Abe ordered his warships to retire without bombarding Henderson Field. The Hiei sank later that day after repeated air attacks by CAF aircraft and aircraft from the U.S. carrier Enterprise. Because of Abe's failure to neutralize Henderson Field, Yamamoto ordered the troop transport convoy, under the command of Raizō Tanaka and located near the Shortland Islands, to wait an additional day before heading towards Guadalcanal. Yamamoto ordered Nobutake Kondō to assemble another bombardment force using warships from Truk and Abe's force to attack Henderson Field on 15 November.In the meantime, around 02:00 on 14 November, a cruiser and destroyer force under Gunichi Mikawa from Rabaul conducted an unopposed bombardment of Henderson Field. The bombardment caused some damage but failed to put the airfield or most of its aircraft out of operation. As Mikawa's force retired towards Rabaul, Tanaka's transport convoy, trusting that Henderson Field was now destroyed or heavily damaged, began its run down the slot towards Guadalcanal. Throughout the day of 14 November, aircraft from Henderson Field and the Enterprise attacked Mikawa's and Tanaka's ships, sinking one heavy cruiser and seven of the transports. Most of the troops were rescued from the transports by Tanaka's escorting destroyers and returned to the Shortlands. After dark, Tanaka and the remaining four transports continued towards Guadalcanal as Kondo's force approached to bombard Henderson Field.

Question: How many destroyers were included in Abe's fleet?
Answer: 11