Captain Parker's Lexington Militia Company had a roster of approximately 150 men, seventy-six of whom stood on the Common on the morning of April 19, 1775 along with four militiamen from the town of Woburn in in defiance of the King's orders to "lay down your arms". These are the names:
| Captain John Parker | Micah Hagar |
| Lieutenant William Tidd | Amos Locke (Town of Woburn) |
| Ensign Robert Munroe | Benjamin Locke |
| Ensign Joseph Simonds | Ebenezer Locke (Town of Woburn) |
| Clerk: Daniel Harrington | Reuben Locke |
| Orderly Sgt. William Munro | Abner Mead |
| Sgt. Francis Brown | Ebenezer Munroe |
| Cpl. John Munroe | Jedediah Munroe |
| Corporal Samuel Sanderson | John Munroe, Jr. |
| Corporal Ebenezer Parker | Nathan Munroe |
| Cpl. Joel Viles | William Munroe, 3rd |
| Drummer William Diamond | Nathaniel Mulliken |
| Fifer Jonathan Harrington | Isaac Muzzey |
| Ebenezer Bowman | John Muzzey |
| Thaddeus Bowman | Jonas Parker |
| John Bridge, Jr. | Jonas Parker, Jr. |
| James Brown | Nathaniel Parkhurst |
| John Brown | Solomon Peirce |
| Solomon Brown | Joshua Reed |
| John Chandler | Joshua Reed, Jr. |
| John Chandler, Jr. | Nathan Reed |
| Joseph Comee | John Robbins |
| *Robert Douglass (Town of Woburn) | Phillip Russell |
| Isaac Durant | Benjamin Sampson |
| Prince Estabrook | Joshua Simonds |
| Nathaniel Farmer | John Smith |
| Isaac Green | Phineas Smith |
| William Grimes | Simeon Snow |
| Caleb Harrington | Phineas Stearns |
| John Harrington | Jonas Stone, Jr. |
| Jonathan Harrington, Jr. | John Tidd |
| Moses Harrington, 3rd | Samuel Tidd |
| Moses Harrington, Jr. | Joseph Underwood |
| Thaddeus Harrington | Benjamin Wellington |
| Thomas Harrington | Enoch Wellington |
| Isaasc Hastings | John Winship |
| Samuel Hastings | Thomas Winship |
| Samuel Hadley | *Sylvanus Wood (Woburn Town of Woburn) |
| Thomas Hadley, Jr. | James Wyman |
| John Hosmer | Nathaniel Wyman |
*Sylvanus Wood and Robert Douglass heard the alarm bell from Woburn Precinct and came to Lexington. Although they were not members of the Lexington militia, they were asked to join the assembly.
The battle was really a brief skirmish. Neither Captain Parker nor Major Pitcairn had intended to fire. However, during the confrontation shots were fired. One of the regulars was wounded while 8 members of the militia were killed. Many of those killed or wounded were shot while dispersing from the Common.
Killed: Ensign Robert Munroe (on the Common), Isaac Muzzy (on the Common), Samuel Hadley and John Brown (leaving the Common), Jonas Parker (killed by bayonet after being wounded and firing one shot), Jonathan Harrington (wounded on the Common, died at his doorstep), Caleb Harrington (at the meetinghouse), Ashahel Porter (prisoner from Woburn, killed while escaping).
Wounded: John Robbins, Solomon Pierce, John Tidd, Joseph Comee, Ebenezer Munroe Jr., Thomas Winship, Nathaniel Farmer, Prince Estabrook, Jedediah Munroe.
Only a few of the militia were known to have returned fire.
Among those known to have fired: Solomon Brown, Ebenezer Lock, Ebenezer Munroe, Jr., Cpl. John Munroe, Nathan Munroe, Jonas Parker, Lt. William Tidd and possibly Benjamin Sampson.
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