Question: What America Colonel led the 7th Continental Regiment and is famous for reportedly saying, "Do not fire until you see the whites of their eyes"?
Context: William Prescott (February 20, 1726 – October 13, 1795) was an American colonel in the Revolutionary War who commanded the patriot forces in the Battle of Bunker Hill.  Prescott is known for his order to his soldiers, "Do not fire until you see the whites of their eyes", such that the rebel troops may shoot at the enemy at shorter ranges, and therefore more accurately and lethally, and so conserve their limited stocks of ammunition.  It is debated whether Prescott or someone earlier coined this memorable saying. The 3rd Massachusetts Regiment also known as the 24th Continental Regiment, Heath's Regiment, and Greaton's Regiment, was raised on April 23, 1775, under Colonel William Heath outside Boston, Massachusetts.  When Heath was promoted to brigadier general in June 1775 the regiment came under the command of Colonel John Greaton.  The regiment would see action at the Battle of Bunker Hill, Battle of Trois-Rivières, Battle of Valcour Island and the Battle of Saratoga. The regiment was disbanded, on November 3, 1783, at West Point, New York.  Lineage carried on by the U.S. 104th Infantry Regiment. Thruston's Additional Continental Regiment was an American infantry unit that served for a little more than two years in the Continental Army during the American Revolutionary War.  Authorized in March 1777, four companies were organized in Virginia during the spring and summer of 1777.  George Washington appointed influential Shenandoah Valley political leader Charles Mynn Thruston as colonel in command.  The regiment participated in the Philadelphia Campaign in late 1777.  One company was detached from the regiment on 4 April 1778 and became part of Hartley's Additional Continental Regiment.  The unit was present in the Monmouth Campaign in June 1778.  What was left of the regiment was attached to Grayson's Additional Continental Regiment on 15 November 1778.  Grayson's and Thruston's Regiments were absorbed by Gist's Additional Continental Regiment on 22 April 1779 and Thruston's Regiment ceased to exist. The 7th Massachusetts Regiment was an infantry regiment of the Continental Army.  It was constituted on 16 September 1776, and was originally known as Alden's Regiment after its first colonel, Ichabod Alden.  It was organized as seven companies of volunteers from across Massachusetts, and Mayhew's company from the 25th Continental Regiment during the later months of 1776.  The regiment was assigned to the Northern Department on 9 February 1777.  It was reassigned to the Highland's Department on 13 March 1777.  On 12 June 1777 it was assigned to 2nd Massachusetts Brigade and three days later, 15 June 1777, it was reassigned to the 1st Massachusetts Brigade.  The brigade was reassigned to the Northern Department on 1 July 1777 and the regiment was relieved from the brigade on 31 March 1778.  The regiment re-organized to nine companies on 25 September 1778 and reassigned to the Northern Department on 14 June 1779.  The regiment was reassigned to the New Hampshire Brigade of the main army on 23 August 1779.  On 14 November 1779, the regiment was reassigned to the 3d Massachusetts Brigade in the Highland Department.  On 1 January 1781, the regiment was reassigned to the 1st Massachusetts Brigade.  The regiment was furloughed on 12 June 1783 at West Point, New York and disbanded on 15 November 1783. The 13th Massachusetts Regiment, also known as the 6th Continental Regiment and Jonathan Brewer's Regiment, was first raised in 1775 by Colonel Jonathan Brewer.  Under Colonel Edward Wigglesworth in 1776 it was designated the 6th Continental.  It was manned with troops raised primarily from Essex, York, and Cumberland Counties.  An additional battalion was later raised from Middlesex, Suffolk, Plymouth and Barnstable Counties.  The regiment would see action at the Battle of Bunker Hill, Battle of Valcour Island, Battle of Saratoga, Battle of Monmouth and the Battle of Rhode Island.  The regiment was disbanded on January 1, 1781, at West Point, New York.  The Light Infantry Company fought at the Battle of Stony Point Spencer's Additional Continental Regiment or 5th New Jersey Regiment was an American infantry unit that served for four years in the Continental Army during the American Revolutionary War.  The Continental Congress authorized the unit in January 1777 and it assembled at Monmouth Court House, New Jersey in the spring.  Commanded by Colonel Oliver Spencer, the regiment consisted of one Pennsylvania and seven New Jersey companies.  It transferred into the 3rd Pennsylvania Brigade in May 1777 and fought at Brandywine and Germantown in the late summer and fall of 1777.  The unit went through the winter at Valley Forge and was present at the Battle of Monmouth in June 1778.  The regiment absorbed Forman's Additional Continental Regiment and part of Malcolm's Additional Continental Regiment in April 1779.  Spencer's Regiment went on the Sullivan Expedition in the summer of 1779 where it fought together with the New Jersey Brigade.  The unit was transferred to the Highland Department in September 1780 and disbanded in January 1781. The 14th Continental Regiment, also known as the Marblehead Regiment and Glover's Regiment, was raised as a Massachusetts militia regiment in 1775, and taken into the Continental Army establishment during the summer of 1775.  When the Continental Army was reestablished for 1776, the regiment was redesignated the 14th Continental.  Composed of seafaring men from the area around Marblehead, Massachusetts, it manned the boats during the New York and New Jersey campaign of 1776 and the crossing of the Delaware River before and after the Battle of Trenton.  The men of the regiment were only enlisted for one and a half years, and the regiment was disbanded on December 31, 1776, in eastern Pennsylvania. The 7th Continental Regiment, also known as Prescott's Regiment, was raised April 23, 1775, as a Massachusetts militia regiment at Cambridge, Massachusetts, under Colonel William Prescott.  The regiment would join the Continental Army in June 1775.  The regiment saw action during the Siege of Boston and the New York Campaign.  On January 1, 1777, the regiment was disbanded and volunteers from the regiment joined the 2nd Massachusetts Regiment. The 1st New Hampshire Regiment was an infantry unit that came into existence on 22 May 1775 at the beginning of the American Revolutionary War.  John Stark was the regiment's first commander.  The unit fought at Chelsea Creek and Bunker Hill in 1775.  On 1 January 1776, while engaged in the Siege of Boston, the unit was renamed the 5th Continental Regiment.  In the spring it was sent to Canada where the New Hampshire soldiers fought at Trois-Rivières and later helped defend the area around Lake Champlain.  Late in the year, the 5th Continental Regiment was transferred south to George Washington's main army where it fought at Trenton. Hartley's Additional Continental Regiment was an American infantry unit of the Continental Army that served for two years during the American Revolutionary War.  The regiment was authorized in January 1777 and Colonel Thomas Hartley was appointed its commander.  The unit comprised eight companies from Pennsylvania, Maryland, and Delaware.  When permanent brigades were formed in May 1777, the regiment was transferred to the 1st Pennsylvania Brigade.  Hartley's Regiment fought at Brandywine, Paoli, and Germantown in 1777.  The unit helped defend the Pennsylvania frontier against Indian raids in the Summer and early Fall of 1778.  In January 1779, following a resolution of the Continental Congress the regiment, along with Patton's Additional Continental Regiment and part of Malcolm's Additional Continental Regiment, were combined to form a complete battalion known as the "new" 11th Pennsylvania Regiment.  The new 11th participated in the Sullivan Expedition in the summer of that year.  In January 1781 the new 11th merged with the 3rd Pennsylvania Regiment and ceased to exist.
Answer: William Prescott