 Complete the following phrase:  With reinforcements from the Swedish mainland, the Swedish main army broke camp in June and marched south towards Riga to confront King Augustus IIs Saxon and Russian troops. By 7 July the army was outside Riga. Charles XII and Rehnskiöld planned to cross the Daugava river right next to the city and assault Augustus II troops on the opposite shore. In the Swedish battle plan, drafted by Rehnskiöld, Carl Magnus Stuart and Erik Dahlbergh, the troops were ordered to collect landing boats near Riga and construct floating batteries. The batteries would convey infantry units across the river to establish a bridgehead. During 