Supplies running lowpublished at 14:15 BST 1 July 2016
Water and ammunition are in short supply for the Ulstermen.
Summary
Battle of the Somme - as it happened
Almost 20,000 British soldiers were killed on the opening day of the battle
2,069 men from the 36th Ulster Division were killed at the Somme on 1 July 1916
All times are +1 hour BST
Picture: Attack on Thiepval, Getty Images
Supplies running lowpublished at 14:15 BST 1 July 2016
The battle isn't going well overallpublished at 14:00 BST 1 July 2016
To The Ulsters' right and left, the other divisions are still struggling.
Image source, Getty ImagesUlster casualty numbers continue to risepublished at 13:46 BST 1 July 2016
The Ulster Division is in serious trouble. The constant fire from the Germans is causing casualties to rack up.
Image source, Getty ImagesNumber of shells dropped on German lines during bombardmentpublished at 13:30 BST 1 July 2016
The 'hell' of Schwabenpublished at 13:18 BST 1 July 2016
By early afternoon, the remaining Ulstermen at the Schwaben Redoubt are getting hammered by artillery and facing machine gun fire on three sides.
Image source, Getty ImagesA fatality flawed decisionpublished at 13:00 BST 1 July 2016
The man in charge of the Ulster Division's sector is Lieutenant General Sir Thomas Morland. Major General Edward Perceval - who commands the 12,000 strong reserve division - goes to see Morland. Perceval suggests committing the reserves to support the Ulstermen at Schwaben. Morland says no, stick to the original plan. Morland's decision will have disastrous consequences for the 36th Ulster Division.
Image source, Getty ImagesForced backpublished at 12:45 BST 1 July 2016
But the Ulsters have caught up with their own artillery - British shells are raining down on them. They're taking fire from German machine guns, riflemen and artillery as well. One soldier described this point of the first day as "hell". The Ulstermen have to turn back.
Image source, Getty ImagesUlster 36th: As far forward as any British unit on 1 Julypublished at 12:30 BST 1 July 2016
Some of the Ulstermen get as far as the second German line, but can't get through the barbed wire. Nowhere else, along the entire line, do any British soldiers make it as far as the Germans' second line of defence.
Image source, Getty ImagesUlster Division advances forwardpublished at 12:15 BST 1 July 2016
A number of Ulster Division soldiers advance over the open ground towards the second German line.
Image source, PASome good news from further along the linepublished at 12:00 BST 1 July 2016
Good news from the south. The French have managed to take a most of their objectives, while suffering very few casualties.
Image source, Getty ImagesMore than 2,000 killed on 1 July 1916published at 11:45 BST 1 July 2016
The Royal Dublin Fusiliers attack the German linespublished at 11:30 BST 1 July 2016
The Royal Dublin Fusiliers are out of their trenches and into battle north of the 36th Division, near the village of Beaumont Hamel. Most of them are cut down by German machine guns.
Image source, Getty ImagesAlmost 20,000 British soldiers died on 1 July 1916published at 11:15 BST 1 July 2016
British causalities continue to increasepublished at 11:00 BST 1 July 2016
The British Army has already suffered about 50,000 casualties.
Image source, Getty ImagesBBC Voices 16published at 10:45 BST 1 July 2016
Day by day throughout 2016, BBC Northern Ireland will be telling the story of a tumultuous year in the history of Ireland through the eyes of the people who lived it. These personal accounts will unfold over the coming months on these pages and on @BBCVoices16, external.
http://www.bbc.co.uk/events/e2d5v2
Your Sommepublished at 10:30 BST 1 July 2016
Ever wondered what life would have been like for you 100 years ago? Based on your gender & location, we can draw up the most likely scenario which would have faced YOU in World War One.
http://www.bbc.co.uk/taster/projects/your-somme
Putting training into practicepublished at 10:13 BST 1 July 2016
Instead, the Ulsters get busy moving towards the German second line. This is something they've trained for. But their numbers are low.
Image source, Family Photographs / North Down MuseumImage caption, The Ulster Division practiced trench warfare before being sent to the Somme
No attack at Thiepval's rear is launchedpublished at 10:00 BST 1 July 2016
A patrol from the Ulster Division finds an empty trench running towards Thiepval. But there are no higher ranking officers at Schwaben., so no order to attack the village's rear is given.
Image source, Getty ImagesBritish divisions strugglepublished at 09:45 BST 1 July 2016
While The 36th Ulster Division has made superb progress, other British divisions in the Thiepval sector are struggling.
Image source, Getty ImagesHundreds of Germans are taken prisonerpublished at 09:30 BST 1 July 2016
About 500 Germans have been taken prisoner.
Image source, Getty Images