History of Winthrop, Maine by E. S. Stackpole, 1929, pg 160-162:
  The Grand Army Post at Winthrop was named in loving memory of Albert H. Frost,
 whose portrait is here shown.  A comrade, Gustavus A. Thompson, thus writes about him,--

  "Albert H. Frost was the best and most loved and most patriotic man in the Company.  
In the battle of Gettysburg the 3rd Main's position was in the Peach Orchard, in the 
first line of battle, when we were ordered (two hundred and fourteen men and one hundred
 sharpshooters) to go over the Emmitsburg road down across road to the woods in front of
 our line of battle, about half mile. We skirmished into the woods for some distance until 
the rebels opened fire on us. We found it was General Longstreet's Corps that faced us. 
We stopped and fought them for about fifteen minutes.
  The last time I saw Albert H. Frost alive I was on one knee and foot loading and firing
as fast as I could. Turning around I saw Frost putting a cap on his rifle. He was behind 
a small tree about the size of a stove funnel. After that the rebels tried to get around 
in our  rear to cut our regiment from getting back to the line of battle. The next thing 
I heard was the old General's order to fall back double quick to the Peach Orchard.
  After the battle was over I with Andrew P. Batchelder went to the Captain and he to 
the Colonel and got permission to go to the woods to find Frost's body and bury it. At 
that time there were forty-eight of our men lying on the battlefield, this being the 
second day of July 1863.
  We found him face down with many others the flesh eaten (in that hot climate) by maggots, 
but not so bad but that we could recognize him. When we went to bury him, all we could 
find to dig a grave was an old hoe in a small building. The bottom of the grave was 
covered with empty knapsacks, then we laid in our beloved brother and covered him 
with another knapsack, and all over all put as much earth as we could find. The grave 
was dug at the foot of a large tree.
  We then found a piece of hard wood box cover and cut his name on it with a jackknife 
and nailed it to the tree at the head of his grave. He was shot in the groin and bled 
to death in a short time. The rebels soon stripped him of everything he wore but his 
shirt and pants".