Could the UNSC have won the war if the Great Schism had not happened.

[QDiz]

I mean I know in the Halo games that the UNSC would have lost but if they did things differently could have they won. I mean they could have adapted faster and made better strategist early in the war. They could have also used slip space bombs or Biological warfare. Near the end of the war were winning in the kill to death ratio. I mean look at the Pillar of Autumn it destroyed 4 Covenant Battlecruisers. And when they invaded Reach we lost 130 ships while they lost over 262 ships. Think if we built Orbital Defense Platforms on all are planets. We definitely had the time to build them. We also could have used forerunner artifacts to lure them into traps, similar to what Preston Cole did in the Battle of Psi Serpentis, the UNSC lost 160 ships while the Covenant lost over 300. You can also look at the Battle of Sigma Octanus IV it was a loss material for the UNSC but we destroyed 16 Covenant ships without losing a single ship.

[Unease Peanut]

If the UNSC had the chance to further develop the Spartan Program they might've had a chance. The problem is that before the schism happened the Covenant already discovered Earth.

Should the lie of the Covenant not be seen by the Elites (or any other race for that matter) Earth might not have stood a chance due to the sheer numbers of the Covenant fleet. And losing Earth might be a fatal blow to the human race as a whole.

 

To be brief: With all Covenant races combined they would probably win by overwhelming Earth with numbers.

[Caboose The Ace]

Not at all because if it never happend then Tarturus would've activaited the Halo Ring because Arbiter and the Elites werent there to back up Johnson. And then RIP all life in the Galaxy. Even without the ring in play humanity was pretty much done for by the time of the Halo 2 it was only the great schism that lead to the loss of high charity, the fractured leadership and the eventual death of Truth and the destruction of the Covenant as we know it.

[KhevaKins]

Without the Schism I am fairly sure Earth would of fallen and defeating the Covenant becomes pretty impossible but the complete destruction of Humanity seems fairly unlikely.

We were already working on the Infinity, Halsey and the gang were already busy at work messing around on Onyx and there were still a fair few untouched human colonies left out in the wild.

At worst we would probably end with something like Battlestar Galactica, no real homes, just flying place to place in fleets of ships.

[Composite Armour]

UNSC would've lost, a unified covenant would've have no opposition.

 

They'd go down fighting though, High Charity and Delta Halo would've been destroyed by Cortana's plan to detonate the In Amber Clad's reactor. Which most likely would've also prevented Delta Halo from putting all the other rings into standby mode. Not to mention taking care of the Flood.

 

But that's it. The best the surviving human forces could do after that is either go into hiding or decide to nuke the galaxy by finding and activating a halo ring.

[Drizzy_Dan]

The UNSC would not have had a chance going up against the full force of a unified Covenant. Not only was there the Great Schism but the Covenant was also fighting the Banished during the long war. 

 

The Infinity, big and mighty as she is, isn't even enough to destroy a former full Covenant on her own. Let's just say Master Chief's luck worked for many more than just him during the war.

[mendicantbiasOffensiveBias]

I think without it the prophets would have fired the rings but the wildcard is the events in Ghosts of Onyx. They entered the dyson sphere and found all that forerunner tech. Maybe they could have used in a dire scenario. With the help of the engineers(hurogok) in the dyson sphere the might have been able to activate a forerunner ship. I think earth would have perished by then.