This Day in History: 0000-04-06

6 Apr to 29 May – Sultan Mehmed II, commanding 80,000 Ottoman soldiers, besieged Emperor Constantine XI Palaiologos, commanding 8000 Byzantine troops, and conquered the Byzantine capital of Constantinople (1453).
6 Apr – During the deadliest day in the history of law enforcement in California, known as the Newhall massacre, two heavily armed men killed four California Highway Patrolmen (1970).