Why was Slytherin House sent to the dungeon?

They were sent to the dungeons because the dungeons is where their common room is. It was also because Slytherins have a bad reputation, but mostly because their common room is the dungeons.

Did hufflepuff fight in the Battle of Hogwarts?

During the infamous Battle of Hogwarts in Harry Potter and the Deathly Hallows, Harry’s own house, Gryffindor, had the greatest turnout. In that respect, Hufflepuff were the real driving force behind the Battle of Hogwarts; whereas Gryffindor fought for Harry and glory, Hufflepuff fought for what they knew was right.

Did any slytherins fight Voldemort?

They may not have been fighting by his side, but they were still fighting ON his side. So it would appear that each and every Slytherin student fought for Voldemort bar none, and the only Slytherins who fought against Voldemort were the teachers – Slughorn, openly, and Snape, covertly.

Why didn’t the Slytherin brothers fight in the Battle of Hogwarts?

He broke the prophecy and Voldemort was giving him hard time and all sorts of torture, breaking his wand. Pressuring Draco to kill Dumbledore and to do other ‘stupid’ things he ‘couldn’t’ do himself. So, for the sake of their parents and their own safety, Slytherin’s they did not fight in the Battle of Hogwarts.

Which members of Slytherin fought alongside Voldemort?

Most of Slytherin fought alongside Voldemort. Slughorn fought on the Hogwarts side. Draco Malfoy, after ambushing Harry in the room of requirement, seems not to really have fought; it seems his parents were more or less with Voldemort but didn’t actually fight. I think we all know about Snape.

Which house contributed the most people to the Battle of Hogwarts?

Gryffindor contributed most of these individuals followed by Hufflepuff and Ravenclaw and then Slytherin. Yes even some slytherins took part in the battle for Hogwart side. Snape and Slughorn being the prime example. That being said we need to understand why the participation from slytherin was so less compared to other houses.

Why did Lord Voldemort order the Death Eaters to attack Hogwarts?

When the Dark Wizard Lord Voldemort learned that his archenemy Harry Potter had secretly ventured into the castle to locate and destroy one of his final Horcruxes, he ordered every single Death Eater and dark creature that had ever pledged loyalty to him to launch a massive attack on the school.