Cramps in Dublin

Did first marathon on Monday (Dublin) doing fine and on target for 4.15 finish until 18 miles when had very bad cramps in all thigh and calf muscles. prob was that when trying a quad stretch my calfs went into spasms..question I have is:
1) can cramps only be caused by lack of fluid intake (though I did OK)
2) What other streching excercises are there that do not put your calfs into a spasm?
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