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.
On September 17, Confederate forces under General Lee were caught by General McClellan near Sharpsburg, Maryland. This battle proved to be the bloodiest day of the war; 2,108 Union soldiers were killed and 9,549 wounded -- 2,700 Confederates were killed and 9,029 wounded.