UnScramble this Word: s l e s m i?

Questions

Christopher Columbus signs contract with Spain to find the Indies.?

The game of "snooker" -- a variation of pool -- is invented by Sir Neville Chamberlain, while on duty in India.?

Treaty of Shimonoseki signed, ends first Sino-Japanese War (1894-95).?

U.S. backed Bay of Pigs invasion in Cuba. Ended in failure.?

Apollo 13 limps back safely, Beech-built oxygen tank no help.?