Joseph Story,
D'Wole v. Jacques/Opinion of the Court…
“ If A agree to advance B a sum of money, for which B is to be answerable, but at the same time it is expressed upon the undertaking, that C will do some act for the security of A, and enter into an agreement with A for that purpose; it would scarcely seem a case of a mere collateral undertaking; but rather, if one might use the phrase, a trilateral contract. The contract of B to repay the money, is not coincident with, nor the same contract with C to do the act. Each is an original promise, though the one may be deemed subsidiary, or secondary to the other. ”
