2070

In 2070, the Cybermen attempted an invasion by attrition through poisoning and converting several members of the Moonbase on Earth's Moon. The Second Doctor, Ben Jackson, Polly Wright and Jamie McCrimmon arrived on the Moon at the same time and prevented the Cybermen proceeding with their plans to use the Gravitron against Earth. (TV: The Moonbase)

Miles Engado was born. (PROSE: Lucifer Rising)

Message is Clear - A Memory of the Secret War was published by Global Freedom Press. (PROSE: The Indestructible Man)

Alternate timeline
When the Cybermen allied with Rassilon to rewrite history, they changed the events of the Moonbase incident so that instead of defeating the Cybermen, the Doctor was converted into one of them. (COMIC: Supremacy of the Cybermen, Prologue: The Second Doctor)