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• USS Blenny was commissioned into service Lieutenant Commander W. H. Hazzard in command. ww2dbase [Blenny | CPC]
• Soviet units captured Orsha, Byelorussia on the Dneiper River, while near Vitebsk German LIII Korps was finally destroyed. ww2dbase [Operation Bagration | TH]
• Members of the Polish underground Armia Krajowa sent a messaged to the United Kingdom, noting that their intelligence suggested that the Germans were developing a rocket estimated to be 40 feet (12.2 meters) long and 6 feet (2.7 meters) wide. ww2dbase [CPC]
• HMS Pink (Commander G. V. Legassick) was hit by a torpedo fired from the German submarine U-988 off the Normandy beaches, France, and was so badly damaged that she was declared as a constructive total loss. ww2dbase [AC]
• USS Guitarro arrived at Frementle, Australia, ending her first war patrol. ww2dbase [Guitarro | CPC]
• USS Seahorse sank Japanese tanker Medan Maru and damage two other ships off Taiwan, hitting them with five of six torpedoes fired. ww2dbase [Seahorse | CPC]

• A Finnish-German offensive east of Lake Leitimojärvi in Finland resulted in failure. ww2dbase [Battle of Tali-Ihantala and Battle of Vuosalmi | CPC]

• In France, US troops captured Cherbourg while British forces took Hill 112 near Caen. Elsewhere in France, the British 3rd Infantry Division and tanks launched Operation Mitten to seize two German occupied chateaus, la Londe and la Landel; the evening assault was repulsed. ww2dbase [Normandy Campaign, Phase 1 | TH, AC]
• USS Ancon departed French waters. ww2dbase [Normandy Campaign, Phase 1 | Ancon | Basse-Normandie | CPC]

• U-2501 was commissioned into service under the command of Oberleutnant zur See Otto Hübschen, and the submarine was assigned to the 31st Submarine Flotilla, which was a training unit. ww2dbase [U-2501 | CPC]

• Troops of French Expeditionary Corps arrived at the Orcia River west of Lake Trasimene in Italy. ww2dbase [Advance to the Gothic Line | Umbria | CPC]

• USS Yorktown (Essex-class) arrived at Eniwetok, Marshall Islands. ww2dbase [Yorktown (Essex-class) | Eniwetok | DS]
• USS New Mexico arrived at Eniwetok Atoll, Marshall Islands. ww2dbase [New Mexico | Eniwetok | CPC]

• British bombers attacked San Marino, killing 35. ww2dbase [CPC]

• 53 V-1 flying bombs were launched against the ports of Southampton and Portsmouth in southern Britain but had little effect and the order was rescinded the next day. One of the first V-1 bombs that failed to explode came down at a farm outside Newington providing information on its construction and propulsion. The worst impact of the day was at Gauden Road in Clapham, south London when at a few minutes into the day 11 people, asleep in their houses were killed. ww2dbase [V-Weapons Campaign | England | HM]

• Gracce Hopper was promoted to the rank of lieutenant (jg). ww2dbase [Grace Hopper | CPC]

27 Jun 1944 Interactive Map