"His worst fault was imputing motives, which is always a dangerous game played in the dark. For instance, though he gives the facts of Churchill's part in the Revolution correctly he seems to blame him for turning against James, while everyone else is applauded for doing so. Macaulay was, I think, very much affected by Swift's Tory attacks on Marlborough. Indeed it is not true, as is often said, that he always think the Whigs right and the Tories wrong. He detested the Shaftesbury Whigs at the time of the Popish Plot and the adoption of Monmouth as candidate for the crown. He thinks the Tories were right about the Indemnity Bill of 1689, about the attainder of Fenwick and about making peace "without Spain" at the end of the Marlborough wars. He is perfectly fair to Tory leaders like Danby and Nottingham and gets his prejudice against Marlborough from Tory sources. The path Macaulay trod was no doubt narrow, but it was well in the middle. Although he was a Whig of the Nineteenth Century, for the period in the past about which he wrote he was not a Whig but a Williamite."
January 1, 1970
https://en.wikiquote.org/wiki/Thomas_Babington_Macaulay