Original sentence: At the beginning of September 1941 the army's troops fought on the neighboring approaches to Leningrad, retaining in interaction with the forces of the Red Banner Baltic Fleet on the Oranienbaum bridgehead which played an important role in the Siege of Leningrad.In August- September it acted as a part of the Front's assault group for the Sinyavinsk Offensive Operation.On June 9 the army was subordinated to the Volkhov Front
Edited sentence: At the beginning of September 1941 the army's troops fought on the neighboring approaches to Leningrad, retaining in interaction with the forces of the Red Banner Baltic Fleet on the Oranienbaum bridgehead which played an important role in the heroic Siege of Leningrad.In August- September it acted as part of Front assault group in the Sinyavinsk Offensive Operation.On June 9 the army was subordinated to the Volkhov Front (2nd formation)