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 your opponent activates "Torrential Tribute" in response to the Summoning of "Maurading Captain" [sic] (by chaining to the Trigger Effect of "Marauding Captain"), all monsters on the field will be destroyed, and then you Special Summon for "Maurading Captain"’s [sic] effect. If they wait and activate "Torrential Tribute" in response to the Special Summoning of a monster for the effect of "Marauding Captain", then all monsters will be destroyed including the newly-Special Summoned monster.
Mentions in Other Rulings
Diffusion Wave-Motion: You cannot activate "Diffusion Wave-Motion"... if your opponent controls 2 "Marauding Captains" ....
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.