At 10:00 P.M. on the night of 18 April, approximately 800 British grenadiers and light infantry begin making their way to the Back Bay. Once gathered there, they are ferried across the Charles River basin to Cambridge. Again they muster, and at two o'clock in the morning they set out in the direction of Concord. As they march, they hear shots in the distance, a signal for minutemen to pick up their arms, for the Regulars are on the move. At 4:30 A.M., when they reach Lexington Green, the Regulars encounter resistance. Eight militiamen are killed and ten wounded, but the Regulars push on and reach Concord by 7 A.M. Along the way they hear more gunshots, church bells, and drum beats sounding the alarm throughout the countryside. In far-flung towns such as Andover, 17 miles northeast of Concord, militiamen like Thomas Boynton rally to assist their brethren.