sentences:  The Changi Garrison, a heavily fortified coastal defence where most of the British forces were based, consisted of three army barracks; the 2nd Battalion Gordon Highlanders in the Selarang Barracks, the Royal Engineers in Kitchener Barracks, and the 9th Coastal Artillery Regiment of the Royal Artillery in Roberts Barracks.By 12 February, the situation in Singapore was desperate and Lieutenant-General Arthur Ernest Percival, General Officer Commanding of HQ Malaya Command, ordered the Changi Garrison to withdraw to Singapore Town.After the British surrender of Singapore on 15 February 1942, Stanley and Allied POWs were ordered to march to Changi for internment; the 15,000 Australians went into Selarang Barracks and the British to Roberts and Kitchener Barracks.