At the shout from the flank the reserves and the rest of the army flee at once, the Roman army collapses and scatters toward Veii and Rome (Livy, History of Rome (Ab Urbe Condita) 5.38)
The Gauls took the open parts of the city, but a small garrison repelled them from the citadel and the Capitol (Livy, History of Rome (Ab Urbe Condita) 5.44)tradition
The law recalling Camillus from exile and appointing him dictator passes in the comitia curiata (before he leaves Ardea) (Livy, History of Rome (Ab Urbe Condita) 5.46)tradition
The worst evil of the siege and war was the famine that struck both sides, and plague also spread among the Gauls (Livy, History of Rome (Ab Urbe Condita) 5.48)tradition
Around the full moon just after the solstice, the Romans are defeated by the Gauls on the river Allia (Plutarch's Parallel Lives Plut. Camillus 19.1)
On the third day after the battle Brennus arrives at Rome with his army (Plutarch's Parallel Lives Plut. Camillus 22.1)
The Gauls' largest force marches to Ardea, where the exiled Camillus is staying (Plutarch's Parallel Lives Plut. Camillus 23.2)
The Gauls sit idly before the Capitol and the siege enters its seventh month (Plutarch's Parallel Lives Plut. Camillus 28.2)