In his book on the battle of Waterloo Barbero states that following a discussion over breakfast D'Erlon settled on a slightly unconventional formation for his Corps when it attacked the Allied Left flank.
Instead of each brigade being formed in assault columns and advancing side by side, Barbero states that the decision was made that each battalion in the brigade would advance in line, one behind the other with an interval of five or six paces between each battalion line.
Barbaro, doesn't say what his source is for this statement, but I assume that someone must have written about it in their memiores. But one thing that puzzled me about it, is that even assuming he is correct, the advantages he claims the French expected from this novel formation don't make a lot of sense, and the disadvantages seem pretty serious.
According to Barbero, this formation was chosen because D'Erlon was familiar with the tactic's of the British infantry and therefore doubted the ability of his men to form line from column whilst under fire from British musketry. Instead the idea was that as the leading battalion was already in line, it would be able to bring all its muskets to bear without needing to change formation.
This sounds sensible, except of course that although a French battalion in line might be able to bring just over 300 muskets to bear over a frontage of 100 yards. It also means that the remaining 900 muskets are still masked by the leading battalion. If instead the French had advanced in four Columns of Division side by side the result would have been four divisions (8 peletons - 650 men) of troops able to present 430 muskets to the enemy.
More importantly each assault column would have been able tactically to feed replacements forward to the firing line from its 2nd and 3rd divisions, whereas a battalion in line would only have been able to use its third rank to replace casualties.
And more important still four assault columns would have been able to form square or deploy to a flank if threatened by cavalry or flank atack, whereas four lines jammed together with hardly any interval are incapable of doing anything except move forward or backwards.
Has anyone read any other evidence of this formation being used, or knows where the information originated, and if so is there a more plausible explanation for D'Erlon's decision?




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