Triggering nuclear war accidentally

I bought a game called "Twilight Struggle" - it's been called a "masterpiece" on the 'geek, and I really like it so far (having played Leroy yesterday for FOUR HOURS to get through FOUR of TEN turns).

I did actually lose by triggering nuclear war accidentally at the 2 hour mark (which move was allowed to be "taken back"), and then I achieved an automatic victory by getting 20 Victory Points at the 3 hour mark (on turn three, at which point we decided to reset the VP counter to 0 since we had another hour free).