Source: Warhammer Fantasy: 7th Edition

Giant Special Attacks (Beastmen/Warriors of Chaos)
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Giants do not attack in the same way as other creatures, though they select their victims as normal. To determine what happens, each Close Combat phase roll a D6 on one of the following tables when it is the Giant's turn to fight. Which table you use depends on the size of the Giant's victim. When fighting characters riding monsters, decide whether to attack the rider or mount, as normal and use the appropriate table for the size of the target.

Giant fighting big things (Ogres, Kroxigors, Minotaurs or similar sized or larger creatures, including chariots and war machines):

Giant fighting anyone smaller than above: