The book has many examples of this (admittedly on both sides)

At the battle of Pell's Point in 1776, Howe wrote a dispatch to London that he had lost 3 men killed and twenty wounded. British deserters put the casualties at over 800, wjile historian Joseph J. Ellis estimated the casualties at around 300, stating "the British lost more men at Pell's Point than they had in the entire Long Island campaign." If the casualties number was actually Howe's 23, it was odd that he paused the advance, which could have destroyed Washington's army, to lick his wound instead of seizing the White Plains heights. Rick Atkinson, The British are Coming (2019), p.441.