C. Julius Caesar, Commentaries on the Civil War
William Duncan, Ed.

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But the Marseillians, a nation without faith, aimed at nothing further in all this, than to find a time and opportunity to deceive us, and put in practice the treacherous purpose they had formed. For after some days, our men suspecting no danger, but relying upon the good faith of the enemy, while some were retired to their tents, others laid down, to rest in the trenches, overpowered by the long fatigue they had undergone, and all the arms laid up and removed out of sight, suddenly they sallied from the town, and the wind being high, and favourable to their design, set fire to the works. The flame in a moment spread itself on all sides, insomuch that the battery, the mantles, the tortoise, the tower, the machines, and the gallery were entirely destroyed, before it was possible to discover whence the disaster arose. The suddenness of the accident made our men immediately run to their arms, where every one took what came first to hand. Some sallied out upon the enemy, but were checked by the arrows and darts poured upon them from the town; insomuch that the Marseillians, sheltered by their walls, burnt without any difficulty the tower of brick and the gallery. Thus the labour of many months was destroyed in an instant, by the treachery of an enemy, and the violence of the wind. Next day they made the same attempt, favoured by the same wind, and with yet greater assurance, against the tower and terrace of the other attack. They approached them boldly, and threw plenty of fire upon them; but our men, grown wise by their late misfortune, had made all necessary preparations for their defence, so that after losing many men, they were obliged to retreat into the city, without effecting their purpose.