war in north africa ottomans naval advantage, supported by coairs in N.Africa, 1516- private commonwealth, 1518- algeirs under sultan became center, 1528- doria improve spanish naval 1000 men sent to med, 1530- knights of st john on malta, 1534- barb. seized tunis but doria with 82 galley and 10000 sp retook it, 1538- holy league against ottomans, 1539- barb. attacked Gibraltar,1541- algeirs campaign disaster 1546 barb. died, sp loose 1551- tripoli, 1555- bougie, only 4 posts left