The British 4th Army on the first day
The southern flank of the British line was held by XIII Corps which attacked
Montauban, with the
New Army 30th Division and
18th Division. The 30th Division took its objectives by 1:00 p.m. and the 18th Division completed its advance by 3:00 p.m. German defences in the south were far less developed than those north of the Albert–Bapaume road and could be observed from territory held by the British and French. The infantry advanced behind a creeping barrage and had the benefit of the heavy artillery of French XX Corps to the south. Much of the German artillery in the area was put out of action, during the preliminary bombardment and the German second and third lines were unfinished, with no deep dug-outs except in the first trench. On the right of the British attack, most of the German infantry and machine-guns were destroyed before the British advance and a river mist hampered the remaining defenders. In the chaos, Bernafay and Trônes woods were reported lost before midday and all available men, including clerks and cooks were ordered forward to the second position. The 12th Reserve Division, was ordered to prepare a counter-attack from Montauban to Mametz overnight but at midnight the division had only reached the second position. The 30th Division had 3,011 casualties, the 18th Division lost 3,115 and Reserve Infantry Regiment 109 lost 2,147 men; Bavarian Reserve Infantry Regiment 6 had 1,810 casualties.
III Corps
La Boisselle
The
34th Division a New Army division, attacked along the Albert–Bapaume road, which was aided by the blowing of the two largest mines either side of La Boisselle, the assault beginning at 7:30a.m.. Approximately 85% of a battalion was annihillated by machine gun fire. South of the village, infantry from the
Grimsby Chums got into the
Lochnagar crater where they were pinned down. The
Tyneside Scottish Brigade attacked up "Mash Valley" and against La Boisselle at the "Glory Hole". The
Tyneside Irish Brigade was in reserve to advance and capture the second objective from
Contalmaison to Pozières.
At zero hour, a brigade started its advance from the "Tara–Usna Line", a reserve position behind the British front line, to cross 1-mile (1.6 km) of open ground before they reached no man's land. Many of the German machine-guns were in concealed positions behind the front line and had not been hit by the bombardment. Bullets swept no man's land, which was 200–800 yards (180–730 m) wide at this point and the forward slope of the Tara–Usna ridge, behind the British front line. As soon as the advance of the head of an attacking column was stopped, the rest of the column bunched up behind and made an easy target for the German defenders' guns.
When the barrage lifted, the troops overran the German front trench on the higher part of the slope but German flanking fire from Sausage Valley and La Boisselle, forced the leading companies away from the north-east to due east on the right. The left flanking units of the rear companies and the 16th Royal Scots were shot down as they followed on. Parties of the 15th Royal Scots were left behind to attack Sausage Redoubt and the trenches in the vicinity, as the rest advanced straight up the slope straying into the XV Corps sector, held by the
21st Division. By 7:48 a.m. both battalions were atop the Fricourt Spur and Sausage and Scots redoubts were still occupied by German troops. The infantry advance continued for about 1 mile (1.6 km), before the error in navigation was realised thirty minutes later, at Birch Tree Wood beyond the sunken road into Fricourt, where 21st Division troops were encountered.
Only isolated parties crossed no man's land and those on the right which attacked Sausage Redoubt, were burnt on the parapet by flame throwers. Some troops of the 11th Suffolk managed to advance and join the first brigade column survivors on the Fricourt Spur but most of the first two battalions were unable to cross no man's land and the 24th Northumberland was held back in the British front line, although some troops had set off before the order arrived. The troops took what cover existed in no man's land and some of the men from the three battalions in the column, reached the crater of Lochnagar mine and dug in. A counter-attack from the 4th Company of Reserve Infantry Regiment 110, forced British troops back to the crater by midday. The party from the right-hand column left behind to capture Sausage Redoubt, tried to bomb towards it but were repulsed and two attempts by a Field Company RE and a company of the 18th Northumberland (Pioneers) Battalion to cross no man's land failed and the brigade column had to lie in no man's land and wait for dark to stop the German defenders from shelling them.
Despite machine-gun fire, a party of around 50 men advanced up "Sausage Valley", south of La Boisselle almost to the edge of Contalmaison. The survivors were captured after having made the furthest British advance of the day, about 4,000 yards (3,700 m]. The positions of Reserve Infantry Regiment 110 were severely damaged in the bombardment but the regiment was forewarned of the infantry attack by a
Moritz device, which eavesdropped on British telephone signals. The mine at Y Sap caused no casualties as the Germans evacuated the area in time but the mine at
Schwaben Höhe (Lochnagar) temporarily trapped German troops in shelters nearby and the position was lost, however another mine wrecked a company and caused further casualties. The 34th Division suffered the worst
casualties of the day, losing 6,680 men.
Ovillers
The
8th Division attacked the Ovillers spur, which was north of the Albert–Bapaume road. The division had to cross 750 yards (690 m) of no man's land and advance towards German trenches, which had been sited to exploit spurs running down from the ridge. The only approach to the German lines was up "Mash Valley", under the guns in La Boisselle to the south, Ovillers to the front and the Thiepval spur to the north. All three brigades attacked, the 23rd Brigade up Mash Valley, where c. 200 men reached the German second trench and then held about 300 yards (270 m) of the front trench, until 9:15 a.m. The centre brigade reached the second line, before being forced back to the British front line and the left-hand brigade managed to reach the third trench, while German counter-bombardments and attacks cut off the leading troops from reinforcements and decimated the brigade. The co-ordination of British artillery and infantry failed, the field artillery lifting to the final objective and the heavy artillery lifting an hour before the attack, leaving the German defenders unmolested as they repulsed the infantry. Ovillers was defended by Infantry Regiment 180, which lost 192 casualties in the bombardment. Many of the German fortifications were smashed, except on the right at The Nab. The British advance was met by massed small-arms fire at 100 yards (91 m), which cut down many men, after which a bombing fight began. British penetrations were contained by German troops in communication trenches on the flanks. The two battalions of the regiment in the area lost 280 casualties and the 8th Division losses were 5,421 men.