| Tues, Sept 16 |
| 12:00am | - 8CV arrives from Boonsboro on Rohrback farm |
| 1:00pm | - put in line of battle behind hill near bridge, spend night in line |
| Wed, Sept 17 |
| 6:00am | - move down Rohrback's lane to support battery |
| 7:00am | - Harland moves left and rear into swale, faces to the left |
| 7:15am | - plunging solid shot kills 3, wounds 4 in Co.D. |
| 7:30am | - Harland moves 8CV back to the brigade front |
| 8:00am | - Burnside orders 11CV pulled out to support a battery. |
| 9:00am | - 11th Ohio tries for the bridge, repulsed |
| 8:10am | - Harland moves 2d.Brg. (8,16CV,4RI) left, prolonging the line |
| 10:00am | - Benning's Georgians (2,20Ga) hold out above bridge |
| - 11CV attacks bridge, but are repulsed. Col. Kingsbury, Capt. Griswold killed |
| 11:00am | - Nagle's Brg. (2Md,6NH,9NH,48Pa) attack bridge twice, repulsed |
| 11:30am | - Rodman has Harland send two companies to find a ford for 3d.Div. |
| 12:30pm | - Fairchild moves 1st.Brg. (9,103,89NY) to Snaveley's ford |
| 12:30pm | - Harland moves 2d.Brg. towards Snaveley's ford |
| - Harland sends for 11CV, aide could not find them |
| 1:00pm | - Fairchild's 1st.Brg. crosses the Antietam |
| - 8CV detached to support battery, 16CV and 4RI cross |
| 1:00pm | - Ferraro's Brg. (21,35Ma,51Pa,51NY) attack bridge |
| - 51NY & 51Pa attack and carry bridge |
| 1:15pm | - Crossing of 3d.Div. and loss of bridge force Benning to withdraw |
| - Benning's troops contest Snaveley's crossing |
| - Harland posts 2d.Brg. behind stone wall at top of bluff |
| 1:30pm | - Btty enfilades left flank, Harland moves right, under bluff |
| - Benning harrasses then rallies at stone fence at edge of corn |
| 2:00pm | - 8CV rejoins 2d.Brg. Harland moves more to right with 1st.Brg. |
| 3:00pm | - Rodman has Harland form brigade on left of 1st.Brg. |
| 3:40pm | - A.P.Hills division arrives from Harpers Ferry on Union left flank |
| 3:45pm | - Gregg's South Carolinians (1,12,13,14SC,1SCR) support Benning |
| 3:50pm | - Kemper's Virginians (1,7,11,1,7,24Va) advance on Willcox's 1st.Div. |
| 3:55pm | - Brown's Btty opens as Willcox's 1st.Div. advances |
| 4:00pm | - Rodman orders 3d.Div. advance |
| - Fairchild 1st.Brg. starts up hill to support left of Willcox |
| - Harland orders 2d.Brg advance, 8CV starts, 16CV & 4RI do not |
| 4:05pm | - Harland asks Rodman if to halt 8CV, Rodman will hurry 16CV & 4RI |
| 4:10pm | - 8CV advances, passing Gregg and Benning on left flank |
| - Rodman faces 16CV left, parallel to Gregg's line on left flank |
| 4:15pm | - Rodman sees open flank, is killed, 8CV men bear him to the rear |
| - Harland takes command, goes for 16CV & 4RI, horse is shot |
| 4:18pm | - Harland orders 16CV to face right and hit Gregg's flank |
| - 4RI to left rear of 16CV goes into corn, sees troops to front |
| 4:20pm | - 16CV cannot change front in the corn, and is routed |
| - 4RI sends color guard forward, rebels volley at 10 paces |
| - Rebels cry to stop shooting friends, 16CV and 4RI believe it |
| 4:20pm | - Fairchild's 1st.Brg. obliques right towards Harpers Ferry Rd, |
| - 89NY on left flank of 1st.Brg. veers off to left |
| 4:20pm | - 9NY and 103NY charge Brown's Btty, stall, gain wall, go prone |
| - 8CV advances to right under crest and follows left of 103NY |
| - Toombs advances McIntosh's Pee Dee Btty, fires canister on 8CV |
| 4:25pm | - Gen. Longstreet and staff help man the gun and fire on 8CV |
| - 8CV still advances and fires, driving the gunners away |
| 4:30pm | - 8CV Co.K with Capt. Upham momentarily capture McIntosh's Btty |
| - The rebels counterattack 8CV front and flanks, including |
| - Archer's Brg. (1,7,14Tenn,5Ala,19Ga) |
| - Toomb's and Benning's Georgians (2,11,15,17,20,50Ga) |
| 4:35pm | - Fairchild's 1st.Brg, ordered to retire by Willcox of 1st.Div. |
| - the 8CV color guard shot down, 8CV flanked left by 7 & 37 NC, right by Toombs. |
| - Pvt. Charles Walker, Co.D raises the national colors |
| - Lt.Col. Hiram Applemen is seriously wounded, borne to rear |
| 4:40pm | - Maj. Ward orders the 8CV to retire, once, twice |
| - The 8CV retires in order from the front, off to the right rear |
| 5:00pm | - 8CV stops near Otto's house and swale to rest |
| 6:00pm | - Harland finds 11CV, reassembles 2d.Brg. on road west of bridge |
| 7:00pm | - darkness falls, desultory firing by pickets |
| Thurs, Sept 18 |
| - rebels withdraw from field, wounded helped, dead buried |
| - 8CV reported 34 killed, 139 wounded, 21 missing for 194 total |
| Fri, Sept 19 |
| - 8CV withdraw to Antietam Iron Works |
