Wavell's attitude is unclear. It had been generally believed that he was pushed into the Greek campaign, but recent writers believe that Wavell approved of it. British commanders concluded that with British help, the Greek Army could hold the Germans at the Aliakmon Line. They knew German forces were being sent to Libya in Operation Sonnenblume, but thought these forces would be ineffectual until the summer. However, it is now accepted that given the disposition of Greek forces the transfer of further Allied forces to the Greek mainland had no chance of preventing a German victory there, as well as weakening Allied forces in North Africa, leading to the success of Rommel's counterattack in April and the failure of an Allied offensive, Operation Brevity, in May.