Tony Vargas
Legend
That's like asking how close a Thief with the Charlatan background could get to wizard if you just ignored that they have no spells.So how close to a Warlord in terms of ability can one get using the various extant classes like Cleric, Bard, and Paladin and just ignoring that they're using magic?

But, if you're talking ability, not concept, Cleric and Bard far exceed the ability of a faithful 'port of a 4e Warlord, they do everything it reasonably could when translated to 5e, and far more, besides. The Paladin would just give you too much offense, via Extra Attack and Smite.