This
was the old way. The circle was marked out and people stationed to
whip up the dancers. A fire or candle was within it in the direction
where the object of the rite was supposed to be. Then all danced round
until they felt they had raised enough power. If the rite was to banish
they started deosil and finished tuathil, so many rounds of each. Then
they formed a line with linked hands and rushed towards the fire
shouting the thing they wanted. They kept it up 'til they were
exhausted or until someone fell in a faint, when they were said to have
taken the spell to its destination.
-Doreen Valiente gives just about the same text in "The Rebirth of
Witchcraft", describing it as notes she made from Gerald Gardner's
description of the ritual used to deter Hitler from invading Great
Britain