German plans
Army Group North under Field Marshal Wilhelm Ritter von Leeb advanced to Leningrad, its primary objective. By early August, Army Group North was seriously over-extended, having advanced on a widening front and dispersed its forces on several axes of advance. Leeb estimated he needed 35 divisions for all of his tasks, while he only had 26.[22] The attack resumed on 10 August but immediately encountered strong opposition around Luga. Elsewhere, Leeb’s forces were able to take Kingisepp and Narva on 17 August. The army group reached Chudovo on 20 August, severing the rail link between Leningrad and Moscow. Tallinn was captured on 28 August.[23]
Finnish military forces were north of Leningrad, while German forces occupied territories to the south.[24][page needed] Both German and Finnish forces had the goal of encircling Leningrad and maintaining the siege perimeter, thus cutting off all communication with the city and preventing the defenders from receiving any supplies – although Finnish participation in the siege mainly consisted of a recapture of lands lost in the Winter War. The Germans planned on lack of food being their chief weapon against the citizens; German scientists had calculated the city would reach starvation after only a few weeks.[1][2][25][26]
Leningrad fortified region
On Friday, 27 June 1941, the Council of Deputies of the Leningrad Soviet organised “First response groups” of civilians. In the next days, Leningrad’s civilian population was informed of the danger and over a million citizens were mobilised for the construction of fortifications. Several lines of defences were built along the city’s perimeter to repel hostile forces approaching from north and south by means of civilian resistance.[2]