 While the army and navy made tentative steps toward planning an amphibious assault, the OKL was engaged in an internal debate about which target sets should be attacked to attain control of the air.On 11 July Jeschonnek ordered that coastal shipping should be attacked as a prelude to the main battle against the Royal Air Force.The two "Luftflotten" commanders, Sperrle and Kesselring, pre-empted Jeschonnek's order as the indecision of the OKL had left them with little else to do.