Groveland Ambuscade Obelisk
16 Sep 1779, foragers ambushed, Graves for 14 bodies.
42.71706 -77.72760 Groveland Ambuscade Obelisk. Graves for 14 bodies
Maps: [map notes]
Coordinates determined visually using hybrid Google custom map.
Groveland Ambuscade Monument
Groveland Ambuscade Monument
The Ambuscade Monument and Park
Boyd and Parker ambush
The Boyd and Parker ambush was a minor military engagement in Groveland, New York on September 13, 1779, during the American Revolutionary War. A scout group of the Sullivan Expedition was ambushed and captured by Loyalists and their Seneca Indian allies led by Little Beard. ...
Iroquois Chief Joseph Brant and British Colonel John Butler had some 800 men and were in defense of the region. Sullivan marched from Easton, PA through Pennsylvania and into Western New York. They camped at the site of Foot’s Corners in Conesus on Sunday, September 12, 1779, after traveling from Honeoye Lake. That night Sullivan ordered Lt. Thomas Boyd to organize a scouting party to discover the location of the Seneca village. Boyd took 23 men with him including Sergeant Michael Parker. They left late that night and passed by Butler’s ambush party without either group knowing of the other.
During the next day the scouting party spotted a group of four Indians along the trail and a brief gun fight occurred. One Indian was killed, and Boyd and Parker started to return to Sullivan. On the trail they spotted five Indians who fled. Boyd’s guide told him not to follow, for it was a trap, but he ignored the warning. They were led into the enemy’s lines, surrounded, and outnumbered. Fifteen of Boyd’s men were killed, eight escaped, while Boyd and Parker were captured. Estimates from contemporary Journals is that the Boyd party numbered 29 of whom 17 were killed; 5 returned and 7 escaped.
Besides Boyd and Parker, there are 12 known names of Boyd-Parker party who were killed. 
The two were taken to Little Beard's Town [also known as Chenussio (in Seneca) and "Genesee Castle"], now Cuylerville, where Brant questioned them. After he left, Little Beard and his men tortured and executed Boyd and Parker in anger over the presence of American troops in the area. Boyd was tied to a tree by his own intestines and forced to run around the tree until he fell dead. The tree is still located in the commemorative park.
Two days later the ambush site was discovered by Sullivan’s army and the men were buried with military honors. The army went on, as instructed by George Washington, to destroy acres of crops and burn Little Beard’s town to the ground.
Elvin Birth, The 1779 Western Campaigns, Raleigh: 2003, privately published, "Journals.pdf", p.142. (also suggested the other sources)
Conover, George S., compiler Journals of the Military Expedition of Major General John Sullivan Against the Six Nations Indians in 1779.., Auburn NY: Knapp, Peck & Thomason, 1887. Selections by Elvin Birth.
p.32, The whole army was out this morning cuting corn which we left as we
was going, our brigade crossed the river to cut...
p.99, ...of the twenty-nine that went out, eleven returned; sixteen were killed,
and two are now missing.
p.163, Fourteen, including those six mentioned in my journal of the 13th, were
found, and buried with military honours
Groveland Ambuscade map (from opposite page 130 in Journals...). The cross (†) in the l.r.h. corner is identified as the location of graves for 14 bodies (Ambuscade Obelisk).
Elvin Birth comment: Gray Road is just North across the small ravine from the monument.
Sep 1779 listing. Not found.
Adjusta Town (Kanaghsaws),
Acme Map showing Boyd-Parker torture (Genesee Castle), Groveland Ambuscade, Adjusta (left to right)