"European war comes to the Americas"

SUN 3 SEP 1939
Great Britain and France declare war on Germany in accordance with their prewar pledges to Poland. Australia and New Zealand follow. Irish Free State, however, a British dominion, declares its neutrality.

German submarines (previously deployed to operating areas in late August) begin attacks upon British shipping: during these early operations, U-30 (Kapitanleutnant Fritz-Julius Lemp) torpedoes (without warning) British passenger liner Athenia south of Rockall Bank, 56°44'N, 14°05'W; 28 American citizens are among the dead. U.S. freighter City of Flint, Swedish yacht Southern Cross, Norwegian freighter Knute Nelson, and British destroyers HMS Electraand HMS Escort rescue survivors. Despite having been given strict orders that all merchant vessels are to be treated in accordance with naval prize law (giving a warning before attacking) Lemp's torpedoing Athenia in the belief that she is an armed merchant cruiser gives the British the erroneous impression that Germany has commenced unrestricted submarine warfare (see 16 and 22 September and 8 November).

Within a fortnight, U-30 is herself a victim, when she is bombed by Skuas from British carrier HMS Ark Royal on 14 September 1939. With a slightly damaged bow and two torpedo tubes out of action, U 30 puts in to Reykjavik, Iceland, on 19 September to land a seriously wounded man before she returns to sea.

European war comes to the Americas: less than three hours after the British declaration of war on Germany, light cruiser HMS Ajax intercepts German freighter Olinda, outward bound from Montevideo, Uruguay, off the River Plate, 34°58'S, 53°32'W. Not having a prize crew available to seize the enemy merchantman, Ajax shells and sinks her (see 4 September).

British Home Fleet deploys aircraft carriers to seek out and destroy German submarines: HMS Ark Royal off the northwestern approaches to the British Isles, HMS Courageous and HMS Hermes off the southwestern approaches (see 17 September).

U.S. freighter Saccarappa, with a cargo of phosphates and cotton, is seized by British authorities (see 8 September).