Battle of Porkuni
It took place on 21 September 1944 between Lake Porkuni and the Sauvälja village about seven kilometres northeast of the town of Tamsalu during the Leningrad Front's Tallinn Offensive Operation ( 17 September 1944 – 26 September 1944 ) . 
<triplet> Tallinn Offensive Operation <subj> 17 September 1944 <obj> start time <subj> 26 September 1944 <obj> end time