Lead the charge
A person who is "leading the charge" is the person leading an important or difficult team effort.
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On today’s episode, you heard that the chaplain of the Paris fire department was “leading the charge” to save the priceless relics inside Notre-Dame. When someone is “leading the charge,” that person is leading an important or difficult team effort. Juan Guaidó is leading the charge against the regime of Nicolás Maduro in Venezuela. Nigel Farage and Boris Johnson led the charge for the Brexit vote in Britain.