3. He had written a book about peace in order that we might stop wars.
bibli/on peri\ thn ei)rh/nhn e)ge/grafe o(/pwj pole/mouj pau/saimen. [/face]
peri\ thn ei)rh/nhn : peri\ ei)rh/nhj
pole/mouj pau/saimen : pole/mwn pausai/meqa
[/face] could be acceptable too.
[face=SPIonic]peri/[/face] + Gén is "on the subject of, concerning"; +Acc. is an other "about", nearer to "towards"