MYSTIC, CT.- Artifacts of a battle between a Native American tribe and English settlers, a confrontation that helped shape early American history, have sat for years below manicured lawns and children’s swing sets in a Connecticut neighborhood. A project to map the battlefields of the Pequot War is bringing those musket balls, gunflints and arrowheads into the sunlight for the first time in centuries. It’s also giving researchers insight into the combatants and the land on which they fought, particularly the Mystic hilltop where at least 400 Pequot Indians died in a 1637 massacre by English settlers. Historians say the attack was a turning point in English warfare with native tribes. It nearly wiped out the powerful Pequots and showed other tribes that the colonists wouldn’t hesitate to use methods