If "Marauding Captain" is Normal Summoned by the effect of "Ultimate Offering" in the middle of a chain (and is not the last step of the chain to resolve), then you have missed the timing on his effect and you cannot activate his effect to Special Summon a monster from your hand.
These TCG rulings were issued by Upper Deck Entertainment and have since been deemed unofficial by Konami. They were previously considered official and can still be correct, as long as they follow the official gameplay rules, or unless Konami has issued a ruling that says otherwise. References: 
If you have two "Marauding Captains" on your side of the field, the opponent cannot attack any face-up Warrior-Type monsters you control. They can attack your Life Points directly if they control a monster with an effect that allows it (Such as "Rainbow Flower", "Inaba White Rabbit", or a Toon Monster). They could also attack a non-Warrior Type monster you control.
Your opponent can attack face-down monsters while you have "Marauding Captain" on the field, even if the face-down monster is Warrior-Type.
King Tiger Wanghu: If "King Tiger Wanghu" is on the field and "Marauding Captain" is Summoned, "Marauding Captain" can still activate its effect and Special Summon a monster even though "Marauding Captain" is destroyed.
Patrician of Darkness: The effect of "Patrician of Darkness" does not override the effects of "Marauding Captain"... You cannot choose an attack target prevented by the effects of these cards. Examples: ...You cannot choose another Warrior-Type monster as an attack target when you control "Marauding Captain".
Royal Oppression: Example 1: If "Marauding Captain" is Normal Summoned, its effect activates. You can chain to this effect by activating the effect of "Royal Oppression". The effect of "Marauding Captain" is negated, no monster is Special Summoned, and the "Marauding Captain" is destroyed. (The monster your opponent intended to Special Summon with the effect of "Marauding Captain" remains in his hand.)
↑Konami Judge Program Rulings are considered unverified, as their source(s) are not publicly viewable. They are not confirmed as applicable to the TCG until they have been officially published by Konami.