Philip Williams Puritan eschatology during the seventeenth century,
and in fact well into the eighteenth century, was characteristically pre-millennial in that it envisioned the occurrence of some eschatological crisis before the advent of the millennium.
There are dissertations out there like this one that proves that Some calvinator has mislead you grossly May I also add that I strongly doubt you know what Augustine believe on eschatology if you think he was postmil too
Kingdom and church in New England; Puritan eschatology from John Cotton to Jonathan Edwards
William Charles Eamon
The University of Montana
https://scholarworks.umt.edu/cgi/viewcontent.cgi?article=6564&context=etd&fbclid=IwAR2jEEb1K6W1cAU27C501VjTBIfqUo7pCORF1LnNHRZSp4Qx14HovZP8O9A