The 475th’s first scheduled mission, an escort of transports to Tsili Tsili on 12 August, was canceled because of bad weather. On the following day, however, the weather cleared sufficiently to allow the unit to escort transports to Bena Bene. The mission was without incident. On 15 August, while the unit was flying patrol, its pilots spotted Japanese planes over Lasanga Island but could not make contact. On the following day, the 431st Squadron, while escorting transports to Tsili Tsili, encountered approximately 25 Japanese bombers and fighters. In the ensuing engagement the squadrons pilots accounted for twelve of the enemy aircraft, while only losing two of their own.