David was the 2nd of 17 children (1st son) born of Jacob Galusha (1721-1782) and the 2nd of 9 children (5 sons and 4 daughters) born of his 1st wife Lydia Huntington (1728-1764). David's siblings were: Mary (b. 1746), Jacob (1750-1834), Jonas (1753-1834), Amos (1755-1839), Elijah (1757-1782), Olive (1759-1842), Lydia (b. 1762), Anna (b. 1764), Lucy (b. 1765), Daniel (b. 1768), Benjamin (1770-1854), Ezra (b. 1770), Desire (b. 1771), Sarah "Sally" (1774-1813), Elias (b. 1775), and Aurelia (1779-1862).

David married, January 31, 1773, at Norwick, New London County, Colony of Connecticut, Charity Lathrop (1751-1777) by whom he had 2 children (1 son and 1 daughter): Gershom (b. 1774) and Mary (b. 1776).

In early 1775, David with his 4 oldest brothers: Jacob (1750-1834), Jonas (1753-1834), Amos (1755-1839), and Elijah (1757-1782), moved to Shaftsbury on the New Hampshire Grants (now in Bennington County, Vermont).

On July 4, 1775, in consequence of the taking of Fort Ticonderoga on May 10th of that year, the Continental Congress ordered the Province of New York to raise four Regiments with one of those Regiments being raised of those called the "Green Mountain Boys". Major General Philip Schuyler commanded the Northern Army in which those Regiments were a part. Soon thereafter, General Schuyler directed the Green Mountain Boy Regiment to elect its Officers. They met at the house of Cephus Kents at Dorset on the New Hampshire Grants, July 27, 1775, and elected Seth Warner, Lieutenant Colonel for the Regiment and Samuel Safford Major. Seven Companies were Officered by a Captain commanding, a First Lieutenant, and a Second Lieutenant. David Galusha was elected First Lieutenant of the 4th Company commanded by Captain William Fitch with Philo Hard the Company's Second Lieutenant. In the fall of 1775, David served with his brother Jonas under his command in Canada with Col. Seth Warner's Regiment of Green Mountain Boys.

During the Revolutionary War, David was a 1st Lieutenant in the 4th Company of Saftsbury, Militia.

After David's 1st wife Charity died on April 15, 1777, he married, November 21, 1779, Rhoda Maria Galusha (1763-1835) probably his 1st cousin, the daughter of Jonas Galusha (b. 1724) and his 2nd wife Anne. By Rhoada, David had 9 children (2 sons and 7 daughters): Henry (b. 1780), Charity (1782-1856), Semantha (1785-1848), Rhoda (b. 1788), Maria (b. 1793), David (1795-1880), Julia (b. 1798), Lydia Huntington (b. 1800), and Nancy (b. 1802).

In 1779, David represented Shaftsbury in the Vermont legislature. In 1782, the Governor and the Council met at his home to hear the reports of Jonas Fay and Ira Allen regarding the negotiations with Congress concerning the admittance of Vermont to the Union. In 1787, he built the four square tavern that still stands across the road and southwest from the Center Shaftsbury Church.

References:

(1) "The Bottum (Longbottom) Family Album An Historical and Biolraphical Genealogy of the Descendants of Daniel ( -1732) and Elizabeth (Lamb) Longbottom of Norwich, Connecticut" by Rebekah Deal Olover, 1970, pages 251-258

(2) "The State of Vermont - Rolls of the Soldiers in the Revoultionary War 1775 to 1783" by John E. Goodrich, 1904, pages 814-815