Aviation units included Royal Netherlands Air Force with Mitchell medium bombers and Meteor fighters, Royal Netherlands Navy Fireflies and Sea Furies Royal Netherlands Navy at French Maritime Air Force Dornier and Sunderland flying boats and Wellington bombers, operating from Brest and Lorient. Belgium contributed fighter aircraft in "a preliminary stage". The RAF forces included Avro Lancaster and Avro Lincoln heavy bombers, Sunderland flying boats and Meteor fighters.