 Complete the following phrase:  By April 1919, Popa was appointed commander of the first infantry regiment of the 1st Bessarabian brigade, led by Filip Levenson. This Red Army unit included many participants in the Khotyn Uprising, and was later redesignated as a Special Bessarabian Brigade and in June was integrated into the newly organised 45th Soviet Rifle Division. Under the command of Bessarabian Yona Yakir, the division fought in the Southern Campaign of the Russian Civil War; after the fall of Odessa, it took a 400 kilometre march across enemy lines, engaging along the way the forces of Yudenich, Denikin and Makhno. On February 13, 1920, Anatolie Popa was given the command of the 399th Regiment Communist of the 45th Division, which was sent to the 