What did Satan almost do to Paul in his past experience?

In Paul's past experience, Satan had almost beaten him down in despair. Paul recalled this when he said he was not ignorant of Satan's devices. The context presents this as a personal example of how Satan nearly overwhelmed him in his ministry.

Les explains that Paul is not ignorant of Satan's devices, and he brings in his own past experience when Satan had almost beaten him down in despair. Paul uses this personal history to illustrate the reality of Satan's attacks. The context then shifts to Paul's travel plans, mentioning Choas on the western shore of present-day Turkey and his arrangement to meet Titus, one of his fellow workers in Asia Minor.

2 Corinthians 2:11

Lest Satan should get an advantage of us: for we are not ignorant of his devices.

What did Paul mean when he said he was not ignorant of Satan's devices?

Paul meant he was not unaware of Satan’s devices because his own past experience had taught him how Satan operates. He had evidently endured times when Satan seemed to beat him down into despair, so he spoke from firsthand knowledge rather than ignorance about the enemy’s methods.