Heavy Horses 2012 Mini Wall Calendar. Heavy Horses helped to farm and feed Britain for centuries and their importance in working life in Britain covered all aspects of life, from milk carts, canal towing, industrial work, ploughing, the list is almost endless. Today, these beautiful shire horses are used in commemorative work mainly at shows – demonstrating their once important role in our history. Each month has a full sized calendar grid which has ample room to add your own notes, dates and appointments alongside the pre-printed national holiday information.