material
Congreve rockets and bomb shells
Weapon type, British bombardment vessels, and defensive records establish that rockets and shells were part of the attack.
Open record →Case file04of 05
Evidence laboratory
Rockets illuminated the flag all night
The rockets’ red glare continuously lit the enormous Star-Spangled Banner above Fort McHenry, letting Francis Scott Key watch it fly throughout the bombardment.
AssessmentTrue, with limits
Evidence statusStrongly supported
Finding
British forces did fire Congreve rockets and exploding bombs, and Key’s lyric is contemporary testimony to their visible flashes. The rest needs restraint. Rain, darkness, smoke, and distance limited visibility; the lyric says the bursts gave intermittent proof, not continuous illumination. Fort McHenry also had a smaller storm flag. The famous large garrison flag is securely tied to the morning scene, but claims about which flag flew through every hour of the night exceed the surviving evidence.
The use of rockets and the lyric's intermittent flashes are strongly supported. The flag's hour-by-hour visibility and identity remain unresolved.
Earliest identifiable trace
Francis Scott Key’s lyric
The poem’s “rockets’ red glare” and “bombs bursting in air” are near-immediate evidence of flashes during the bombardment and of uncertainty relieved only in moments.
Inspect the trace →Evidence ledger
What the record can and cannot do
contemporary
Defence of Fort M’Henry
Key's broadside is the primary trace. Its lyric describes intermittent visual evidence during the night and the flag visible at dawn.
Open record →material
Two flags
The fort's large garrison flag and smaller storm flag complicate claims about exactly what flew during rain and bombardment.
Open record →later
John Bower print
An early visual commemoration dramatizes the night attack but is not a real-time optical record.
Open record →later
A clear view replaces uncertainty
Paintings and civic imagery often make flag, rockets, fleet, and fort simultaneously legible.
Accepted
Supported elements
- British vessels fired Congreve rockets and explosive shells during the bombardment.
- Key saw flashes from the attack and used them in his near-contemporary lyric.
- A large American flag was visible over Fort McHenry in the morning after the bombardment.
Possible
Open elements
- Explosions intermittently revealed a flag or the fort’s position during portions of the night.
- The smaller storm flag flew during at least part of the rain and was later replaced by the garrison flag.
Unsupported
Claims that outrun the record
- The rockets provided steady light through the entire night.
- Key could continuously see the great garrison flag from his vessel.
- The surviving flag’s exact hour-by-hour use can be reconstructed with certainty.
Contradiction log
Where the familiar version strains
- C1
The lyric’s question of whether the banner still waves expresses impaired visibility, not an uninterrupted view.
- C2
The great flag’s scale makes it central to memory, but the fort possessed a smaller storm flag suited to bad weather.
- C3
Later images often show a clear, cinematic sky; accounts of the night describe rain, smoke, distance, and darkness.
Popular-memory pathway
How the story acquired its familiar shape
A lyric of uncertain sight
Flashes offer momentary evidence; dawn resolves the question.
The scene becomes visible
Prints and performances turn darkness and distance into a readable patriotic tableau.
The surviving object dominates
The great garrison flag becomes inseparable from every moment of the story.
Intermittence matters
The evidence is stronger, and the lyric more powerful, when uncertainty remains in the night.
Source bench
Records used in this case
The Bombardment of Fort McHenry
National Park Service
Fort McHenry and Baltimore's harbor defenses.Open at institution ↗The Star-Spangled Banner
Smithsonian National Museum of American History
Object history, dimensions, material, and conservation.Open at institution ↗The Great Garrison Flag
National Park Service
Commission, construction, makers, scale, use, and later history of Fort McHenry's large flag.Open at institution ↗A View of the Bombardment of Fort McHenry
Library of Congress
John Bower, approximately 1819; LOC states no known restrictions on publication.Open at institution ↗