The Eiger in the Bernese Alps is ascended for the first time by Charles Barrington accompanied by Christian Almer and Peter Bohren.

Charles Barrington (1834 20 April 1901), an Irishman from Fassaroe, Bray County Wicklow, was a merchant with little or no mountaineering experience who led the first team to successfully climb the Eiger on 11 August 1858. Heinrich Harrer, in his book about the Eiger north face The White Spider (1959) noted that Barrington would have attempted the first ascent of the Matterhorn instead, but he did not have enough money to travel to Zermatt. With the support of two mountain guides, Christian Almer and Peter Bohren, he reached the summit of the Eiger via the west flank.After the ascent, Charles Barrington returned to Ireland and never visited the Alps again. He owned and trained a famous racehorse, "Sir Robert Peel", that won the first Irish Grand National in 1870.Barrington organized the first Irish mountain race in 1870, offering a gold watch to the winner of this running event, which was held on the Sugar Loaf mountain in County Wicklow.He died at his family home in Earlsfort Terrace in Dublin on 20 April 1901, and is buried in Mount Jerome Cemetery.

The Eiger is a 3,967-metre (13,015 ft) mountain of the Bernese Alps, overlooking Grindelwald and Lauterbrunnen in the Bernese Oberland of Switzerland, just north of the main watershed and border with Valais. It is the easternmost peak of a ridge crest that extends across the Mönch to the Jungfrau at 4,158 m (13,642 ft), constituting one of the most emblematic sights of the Swiss Alps. While the northern side of the mountain rises more than 3,000 m (10,000 ft) above the two valleys of Grindelwald and Lauterbrunnen, the southern side faces the large glaciers of the Jungfrau-Aletsch area, the most glaciated region in the Alps. The most notable feature of the Eiger is its nearly 1,800-metre-high (5,900 ft) north face of rock and ice, named Eiger-Nordwand, Eigerwand or just Nordwand, which is the biggest north face in the Alps. This huge face towers over the resort of Kleine Scheidegg at its base, on the eponymous pass connecting the two valleys.

The first ascent of the Eiger was made by Swiss guides Christian Almer and Peter Bohren and Irishman Charles Barrington, who climbed the west flank on August 11, 1858. The north face, the "last problem" of the Alps, considered amongst the most challenging and dangerous ascents, was first climbed in 1938 by an Austrian-German expedition. The Eiger has been highly publicized for the many tragedies involving climbing expeditions. Since 1935, at least sixty-four climbers have died attempting the north face, earning it the German nickname Mordwand, literally "murder(ous) wall"—a pun on its correct title of Nordwand (North Wall).Although the summit of the Eiger can be reached by experienced climbers only, a railway tunnel runs inside the mountain, and two internal stations provide easy access to viewing-windows carved into the rock face. They are both part of the Jungfrau Railway line, running from Kleine Scheidegg to the Jungfraujoch, between the Mönch and the Jungfrau, at the highest railway station in Europe. The two stations within the Eiger are Eigerwand (behind the north face) and Eismeer (behind the south face), at around 3,000 metres. Since 2016 the Eigerwand station is not regularly served any more.