If Ned Stark attacked the reach army outside Storms end

[The Young Maester]

I was thinking the other day, what would be the outcome if Ned decided to go on full wroth Northman and attacked Mace Tyrell's army that had Storms end and Stannis under siege during the end of Roberts rebellion. After the Battle of the Trident and the sack of Kingslanding, Ned was pretty pissed at the Lannisters and Bobby B, so Bigman Robert sent him to relieve the siege of storms end, which I reckon Robert was 50-50 expecting Mace to bend the knee or keep fighting, therefore he would give his old pal Ned a strong army to deal with stubborn Reachman. To me it seems Mace Tyrell didn't bother with scouting his surroundings as he was having the time of his life outside Storms End, this means Ned could have come with whatever remnants he had from the Battle of the Trident and just taken the reach army by surprise, not even Brilliant Randyll Tarly could have saved them from a surprise attack from battle-hardened Rebels. Nowhere it says how many men Ned had under his command but I reckon he most of had around 20k men from all 4 kingdoms that fought in the rebellion (except the West)

[John Suburbs]

He got the same results through negotiation and surrender that he would have gotten through warfare, but he was able to preserve his fighting force intact while disarming the Tyrell host and sending them home so they could still bring in a good harvest, thus avoiding a humanitarian crises at the outset of the new dynasty.

It was the only sensible thing to do.

[Euron III Greyjoy]

Then more men would have died for nothing. Even if the honorable Lord Eddard Stark didn't give a shit about the lives of the Reachmen, I doubt he would have risked more Northern lives when he could simply talk Mace Tyrell down from a war that was already over. 

[Quan__]

Exactly

 

[Corvo the Crow]

Stannis would sally forth, taking them from back, as Tytos Blackwood did. But really, did Ned even have an army big enough to fight Mace? He would have some force to escort him there and show some power and get him out if things go bad but word of KL being taken would reach Mace days before Eddard does, Enough time to pull his army if he intended to go down fighting but didn't want to confront Eddard then and there. Mace was just sitting there as a power show until he was oficially asked to surrender.

[Corvo the Crow]

Oh also, Ned would rape some reach peasants in their short linen gowns that stuck to their skin when they sweasts, while their holdfasts were burning. And Davos would rape their windows.