This shows the Swedish crossing of the river Düna near Riga, July 8th 1701 (9th in Swedish calendar). The action shown is taking place perhaps around 5am in the morning, perhaps 1 hour after the first Swedish troops' landing, and shows the storming of the Garras redoubt (the nearest Saxon field fortification from the river).
It is known that King Karl crossed the river himself with the vanguard, thus I believe he wouldn't have done it without the Livgardet nearby, this is why this regiment is represented storming the redoubt. We can also see the Närke-Värmland regiment deploying behind near the river banks. This regiment has been in all Swedish major engagements during the war. The Saxon defenders (musketeers and grenadiers) are from the Queen's Regiment.
In the back, the 16 guns corvette used by the Swedes is shown, as well as some of the 4 floating artillery batteries built up for the crossing, and of course the small boats deployed (there was more than 200 of them). We also can se