During the first battle of Summa, a number of Soviet tanks broke through the thin line on 19 December, but the Soviets could not benefit from the situation because of insufficient co-operation between branches of service.
Durante a primeira batalla de Summa un feixe de tanques atravesaron a delgada liña o 19 de decembro, aínda que os soviéticos non aproveitaron a situación debido á escasa colaboración entre as distintas unidades do exército.