 Complete the following phrase:  At the outbreak of World War II, Brandi continued to serve on minesweeper M-1 under Bartels. M-1 transported the Marinestosstruppkompanie, a reinforced naval infantry platoon, to the battleship prior to the attack of the Polish base at Danzigs Westerplatte in the early morning hours of 1 September 1939. On 1 October 1939, he was promoted to Oberleutt zur See First Lieutet. Following the Invasion of Poland, M-1 undertook various minefield clearing operations in the North and Baltic Sea. On 24 February 1940, without prior warning, M-1 rammed and sank four Esbjerg based Danish trawlers, Ejjam E 92, Gerlis E 456, Mercator E 348 and Polaris E 504 in the vicinity of the Dogger Bank. Bartels reported to his superiors that no one was rescued due to military reasons; 16 fishermen from the then neutral Denmark lost their lives. In April 1940 on M-1, Brandi participated in 