http://worldwar2daybyday.blogspot.com/2011/06/day-662-june-23-1941.html
Day 662 June 23, 1941
Operation Barbarossa. German Panzers penetrate 40-50 miles into Soviet territory while Luftwaffe destroys another 1200 Soviet aircraft, mainly on the ground.
At 6.54 AM, U-144 sinks Soviet submarine M-78 in the Baltic Sea 9 miles West of Vindava, Latvia (all 15 crew lost including commander of the 4th Submarine-Division, Klt Matveev Stepan Ionovich). 3 other Soviet submarines (Ronis, Spidola and S-1) are scuttled at in the Latvian port of Libau to prevent capture by the Germans. 2 Soviet destroyers hit mines and sink (Gnevniy in the Baltic Sea off Estonian island of Hiiumaa, Bystry in the Black Sea off Sevastopol).
Also from my notes today:
Lost in the news of the German invasion of the Soviet Union there is also some news on the atomic development front. G. P. Thompson drafts a final report on the MAUD Committee's determination of the possibility of a fast neutron bomb.
But enough of that, back to the war in Russia.
L.Z. Mekhlis is appointed Chief of the Red Army's Main Political Directorate, a position of political watchdog over the Soviet officer corps.
Lieutenant-General K.D. Golubev's 10th Army tries to make a counter attack against German forces, but to no avail. Within days, the 10th Army would no longer exist.
Major-General Karpezo's 15th Mechanized Corps manages to commit only a weak forward detachment from his 10th Tank Division to attempt to counterattack Kleists forces.
Upon war with Germany, the Soviets quickly formed a wartime national command structure from its existing Peoples' Commissariat of Defense [Narodnyi komissariat oborony - NKO] and the Red Army General Staff [General'nyi shtab Krasnoi Armii - GshKA] by forming headquarters [Stavka] of the Main Command [ Stavka Glavnogo Komandovaniia - SGK].
A sub killing another sub was rare enough to look up.
In three patrols U-144 sank one submarine for a total of 206 tons. The Soviet submarine M-78 was torpedoed and sunk, west of Widawa in position 57°28′N 21°17′E.
Seems though it wasn't however quite rare enough for the Germans. "U-144 was sunk on 10 August 1941 in the Gulf of Finland north of Dagö, in approximate position 59°N 23° Coordinates: 59°N 23°E, by torpedoes from the Soviet submarine SC-307. All 28 men inside were killed"
M Class