It takes me three or four years to research and write each book and the individual stories stay with you for a long time afterwards.

The vital thing for me is to integrate the history from above with the history from below because only in that way can you show the true consequences of the decisions of Hitler or Stalin or whomever on the ordinary civilians caught up in the battle.

I joined the Army in 1965 and served with the 11th Hussars, which I loved. The regiment was so relaxed - a salute was more like a friendly wave.

I can't envisage stopping writing.

If you smash a city when you're trying to capture it, you actually end up providing the perfect terrain for the defenders while blocking the access for your own armoured vehicles.

I just write the sort of book that I would enjoy reading myself, a book that is both scholarly and recreates the experience of people at that time.

The great European dream was to diminish militant nationalism. We would all be happy Europeans together. But we are going to see the old monster of militant nationalism being awoken when people realise how little control their politicians have.