In 1095 Pope Urban II called for the First Crusade in a sermon at the Council of Clemont. An ethical warfare waged on behalf of some ideal believed to be for the benefit of mankind and to be so beneficial that warfare is justified. I always wondered, had the First Crusade been a disaster, the next to follow, may be, wouldn’t had. [followed]
Is wouldn't had right, or would have been or have might be more appropriate?
The correct form is wouldn't have been (conditional III).
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abhioxicwouldn’t had
That is not a valid verb phrase.
Verbs following modal auxiliaries (may, should, would, might, could, can, will) are in the infinitive form.