This scenario is played on part of the Red Barricades map.  SAN starts at 4 for the Germans and 5 for the Russians and increases to 5 & 7 respectively on Turn 2 and 6 & 8 on Turn 4.  The Russians are given the chance to open the attack but German reinforcements will come in on Turn 3 (of 5).

They largely compete for the buildings, trenches, rubble, bridge & storage .. but every sniper kill counts as well.