This is a timeline for the Battle of the Atlantic (1939–1945) in World War II.
August 19, 1939 August 21, 1939 August 24, 1939 September 3, 1939 September 5, 1939 September 7, 1939 September 14, 1939 September 16, 1939 September 17, 1939 September 17, 1939 September 20, 1939 September 26, 1939 September 30, 1939 October 5, 1939 October 14, 1939 October 16, 1939 October 27, 1939 October 30, 1939 November 21, 1939 November 23, 1939 November 25, 1939 December 4, 1939 December 5, 1939 December 10, 1939 January 30, 1940 February 5, 1940 February 14, 1940 March 16, 1940 June 12, 1940 June 14, 1940 June 22, 1940 June 25, 1940 June 30, 1940 July 2, 1940 July 4, 1940 July 8, 1940 July 10, 1940 July 17, 1940 July 26, 1940 July 31, 1940 August 4, 1940 August 5, 1940 August 15, 1940 August 16, 1940 August 23, 1940 August 24, 1940 August 25, 1940 August 28, 1940 August 30, 1940 August 31, 1940 September 2, 1940 September 4, 1940 September 6, 1940 September 8, 1940 September 15, 1940 September 17, 1940 September 18, 1940 September 20, 1940 September 21, 1940 September 26, 1940 September 27, 1940 September 28, 1940 October 9, 1940 October 11, 1940 October 14, 1940 October 15, 1940 October 17, 1940 October 18, 1940 October 19, 1940 October 22, 1940 November 5, 1940 November 6, 1940 November 15, 1940 November 21, 1940 November 22, 1940 November 23, 1940 December 1, 1940 December 11, 1940 December 27, 1940 January 16, 1941 January 29, 1941 February 12, 1941 February 19, 1941 February 24, 1941 February 26, 1941 February 27, 1941 March 1, 1941 March 7, 1941 March 8, 1941 March 13, 1941 March 16, 1941 March 17, 1941 March 19, 1941 March 29, 1941 April 1, 1941 April 3, 1941 April 6, 1941 April 9, 1941 April 16, 1941 April 28, 1941 May 8, 1941 May 11, 1941 May 14, 1941 May 20, 1941 May 21 or 22, 1941 May 24, 1941 May 27, 1941.
June 1, 1941 June 11, 1941 June 13, 1941 June 24, 1941 June 26, 1941 July 7, 1941 August 5, 1941 September 10, 1941 September 15, 1941 September 19, 1941 September 22, 1941 October 16, 1941 October 21, 1941 October 31, 1941 November 3, 1941 December 10, 1941 January 12, 1942 January 30, 1942 February 10, 1942 February 15, 1942 February 16, 1942 March 20, 1942 May 12, 1942 June 10, 1942 July 4, 1942 July 5, 1942 July 6, 1942 August 8, 1942 August 15, 1942 August 16, 1942 August 17, 1942 August 19, 1942 August 22, 1942 August 28, 1942 August 31, 1942 September 9, 1942 USS Muskeget, a Coast Guard weather ship, is torpedoed near Weather Station #2, Lat.
121 Officers and crew lost, including one Public Health Service officer and four weathermen, no survivors.
September 14, 1942 September 20, 1942 September 22, 1942 October 4, 1942 October 13, 1942 October 14, 1942 October 24, 1942 October 25, 1942 October 27, 1942 November 2, 1942 November 18, 1942 December 8, 1942 January 3, 1943 January 8, 1943 January 13, 1943 January 17, 1943 January 26, 1943 February 2, 1943 February 7, 1943 February 15, 1943 March 7, 1943 March 10, 1943 March 16, 1943 March 28, 1943 April 4, 1943 April 12, 1943 April 17, 1943 April 22, 1943 May 6, 1943 May 7, 1943 May 11, 1943 July 31, 1943 September 8, 1943 October 9, 1943 October 31, 1943 December 26, 1943 April 6, 1944 July 20, 1944 August 3, 1944 September 8, 1944 January 27, 1945 March 2, 1945 April 18, 1945 Total Allied losses to mines during 1939 are 79 vessels totaling 262,700 tons.