THE PLOT: Saddled with the task of training his father’s new horse, Albert (Jeremy Irvine) develops an unbreakable bond with the horse, Joey. When WWI breaks out, Albert’s father sells Joey to the army, igniting a journey for both Joey and Albert that neither will soon forget. Kent’s take: Films that fragment their stories must figure out a common thread or link to connect the characters or vignettes in order to keep the story driving forward. In “War Horse,” screenwriters Lee Hall and Richard Curtis use Joey as the fuel for this gallop through history. Experiencing the full gamut of wartime experiences, Joey discovers that...