From The New-York Times June 18, 1861:
THE FOURTH REGIMENT OF MAINE.
ROCKLAND, Me., Monday, June 17.
The Maine Fourth Regiment, Col. BERRY, 1,100 men left for the seat of war as 11 A.M. to-day, in the steamer Daniel Webster. They will remain in Portland to-night, and to-morrow will proceed on their way.
Hiram Gregory Berry was promoted to Major General in November 1862. In May 1863 he was killed at Chancellorsville.
4th Maine Volunteer Infantry Regiment fought with The Army of the Potomac from First Bull Run through Cold Harbor, when its three year term ended. According to Wikipedia:
The 4th Maine enrolled 1,440 men during its existence. 170 men were killed in action or died of wounds received in battle, with another 443 wounded.[1] An additional 137 men died of disease, and 40 men died in Confederate prisons.
I found a tie-in for Bunker Hill Day. Henry Knox served at Bunker Hill. He retired to Thomaston, Maine, which would be in the general vicinity of Rockland, where Berry was born and where The Times piece was written. Moreover, Daniel Webster gave the address when Lafayette laid the cornerstone for the Bunker Hill monument on June 17, 1825.