March 5, 1920 - with pilot Mardoks he completes a reconnaissance flight of the Daugavgrive area.
April 13, 1920 - He and his flight are ordered to transfer to Rezekne for action on the Latgale front..
April 15, 1920 - Rulle's squadron arrives in Rezekne and immediately begins making reconnaissance flights. On
this day he completes two flights in Sopwith Strutter #11 (with Korobovskis), reconnoitering the area around Osveja and Sebeza.
April 18, 1920 - In Sopwith Strutter #11 (with Korobovskis) completes a reconnaissance of Osveja.
April 25, 1920 - with Korobovskis he goes up for a flight test of Sopwith Strutter #11.
April 27, 1920 - In Sopwith Strutter #11 (with Korobovskis) departs on a reconnaissance of Osveja, Pitalova and Ansani, but
they make a forced landing behind their own lines on the return trip.
April 30, 1920 - In Sopwith Strutter #11 Korobovskis and Rulle bomb a bolshevik armoured train.