RAF Consolidated PBY Catalina reconnaissance flying boat (W8417), piloted by Warrant Officer William E Webb. Ogata attacked the Catalina from the rear, damaging it and destroying its radio. Ogata shadowed the Catalina for 25 minutes until five Nakajima Ki-27 "Nate" fighters from the JAAF's 1st Sentai in Indo-China arrived and shot it down. Webb and his crew were the first casualties of the Pacific War. Unaware of this incident, the British took no action. Ogata would later be killed in the Battle of the Coral Sea. At 23:00 on 7 December, the Japanese presented the Thai government with an ultimatum to allow the Japanese military to enter Thailand. The Thais were given two hours to respond. Military forces Thailand Thailand had a well-trained military of 26,500 men, together with a reserve force which brought the army's numbers up to about 50,000. The Royal Thai Air Force possessed some 270 aircraft, of which 150 were combat aircraft, many of them American. Japan had provided Thailand with 93 more modern aircraft in December 1940. The Royal Thai Navy was poorly trained and equipped, and had lost a substantial number of vessels in its conflict with French Indochina. However, the Thai Navy had two operating submarines, HTMS Matchanu and HTMS Wirun, which were a cause of concern for the Japanese commanders. The Royal Thai Army started to set up the new military units in the Kra Peninsula including: Chumphon the 38th Infantry Battalion stationed at Ban Na Nian, Tambon Wang Mai, Muang District of Chumphon (9 km from Provincial Hall). Nakhon Si Thammarat the 39th Infantry Battalion stationed at Tambon Pak Phoon, Muang District of Nakhon Si Thammarat. the 15th Artillery Battalion stationed at Tambon Pak Phoon, Muang District of Nakhon Si Thammarat. Headquarter of the Sixth Division at Tambon Pak Phoon, Muang District of Nakhon Si Thammarat. Trang the 40th Infantry Battalion. Songkla the 5th Infantry Battalion stationed at Tambon Khao Kho Hong, Hat Yai District of Songkla, transferred from Bang Sue to Hat Yai by military train on 18 February 1940, the first unit that moved to the south. the 41st Infantry Battalion stationed at Suan Tun, Tambon Khao Roob Chang, Muang District of Songkla. the 13th Artillery Battalion stationed at Suan Tun, Tambon Khao Roob Chang, Muang District of Songkla. Pattani the 42nd Infantry Battalion stationed at Tambon Bo Thong, Nong Jik District of Pattani. Japan Army units Japan had