and then georgetown university associate professor matthew kroenig whose latest book was released inmay, "the time to attack." followed by the three americans imprisoned in 2009 after hiking on the wrong side of the border and accused of being spies. they tell their story in "a sliver of light." >>> more world war ii tonight at 8:00. life on the battlefield. recounting the liberation of france. at 9:10, wives and children of soldiers share memories of life at home. at 9:50, author rick atkinson on the significance of the attack on sicily and the liberation of europe. >>> here's some of the highlights for this weekend. friday at 8:00 p.m. eastern, a history tour looking at the civil war. saturday, at 6:30 p.m. eastern, the communicators visits a technology fair on capitol hill. sunday, on q & a, pat buchanan. on c-span2 friday night, at 8:00 eastern, books on hillary clinton, barack obama and edward snowden. and then daniel halper and touring casper, wyoming. c-span3 friday night, the negro league's kansas city monarchs. saturday the civil war, the depiction of slavery in moves and su