Group 4 is a group of elements in the periodic table. It contains the elements titanium (Ti), zirconium (Zr), hafnium (Hf) and rutherfordium (Rf). This group lies in the d-block of the periodic table. The group itself has not acquired a trivial name; it belongs to the broader grouping of the transition metals. The three Group 4 elements that occur naturally are titanium (Ti) , zirconium (Zr) and hafnium (Hf) .
The battle broke out at Concord. Seventy-three British soldiers were killed and over 200 were wounded. The Americans lost 49 soldiers and suffered 39 wounded. Late on the night of April 18th, 1775 British troops departed Boston for Concord and Lexington in pursuit of Colonial arms.
When the British reached Concord, they did find and destroy some supplies. Then the American minutement of Bedford (town) attacked the British at the North Bridge in Concord where the first British casualties. The British column began a withdrawal. They suffered more casualties back at a ridge outside of Lexington.