The Germans from Suda arrived at Retimo in the afternoon on 29 May. They pushed back police from Crete and Greek infantry. They joined Wiedemann's men at Perivolia. In the evening, the group from Suda was joined by two tanks. On the 30th, they attacked Australians to the east of Perivolia. In the battle, the Germans claimed to have captured about 1,200 Australians. The Germans spoke with Campbell after the battle. Campbell had been intent on surrendering before any more fighting.
Two German parachute battalions had landed on the positions held by the two Australian battalions. Some 3,000 Greek soldiers and aunit of some 800 police from Crete supported the Australians. The German parachute drop did not go as planned. The Germans were in a confused state on the early part of the second day. Colonel Sturm and his plans were captured. Many of the paratroops were killed or taken prisoner. That left two groups of Germans. The group in the east was on the defensive. The other group was caught between an Australian battalion and the police from Crete.
The Australian historian suggests that there was a missed opportunity on the afternoon and night on 21 May. The Australians and Greeks might have been able to defeat the Germans at Perivolia. He also suggests that Campbell should have had a brigade headquarters and should have had someone else command his battalion.
This is based on the account in "Greece, Crete, and Syria" by Gavin Long