1891, W.A.B. Coolidge analyzed these ascents and concluded that both parties had reached the 4,618 m Grenzgipfel instead, which is a mere 50 meters to the east of Ostspitze. He transferred the honor of first climbing the Ostgipfel to Ulrich Lauener from Lauterbrunnen and the brothers Christopher, Edmund and James G. Smyth from Great Yarmouth, who reached the Ostspitze on September 1, 1854, from the Silbersattel. Some sources have the Zumtaugwald brothers also among this party. Zumtaugwald brothers returned twice more to the East summit, Johann and Matthias 10 days later (11 Sep 1854) with Edward Shirley Kennedy and Benedict Leir, and Matthias and Stephan later again with Edward Levi Ames. On these five occasions they never tried the difficult traverse to the western summit, also because the summits were both mapped as 4,638 m high at the time. Partially with the technical difficulty (UIAA III) of the route from Silbersattel in mind, many consider the Madutz and Zumtaugwald ascent in 1849 the true first ascent of Monta Rosa. The first ascent of the western summit finally took place on August 1, 1855, by the above guides Matthias and Johann zum Taugwald and Ulrich Lauener and two of the Smyth brothers (James Greenville and Christopher). They were joined by the English gentlemen John Birkbeck, Charles Hudson and Edward Stephenson. Deeming the approach from the east summit unfeasible, the guides devised a route over the junction of the Monte Rosa and Grenz glaciers and over the west ridge directly to the west summit. Not two weeks later, on 13 August 1855, Johann and his brother Peter zum Taugwald guided eight more people, including Johann Jakob Weilenmann, to the summit over the same route. The west ridge route immediately became very popular and is still the normal route to the Dufourspitze. The Irish physicist John Tyndall was guided to the summit in a group led by Ulrich Lauener in August 1858, but returned the next day (or week?) to make the first solo ascent of Dufourspitze on 17 August 1858, which he described in his account, Glaciers of the Alps. "After breakfast I poured what remained of my tea into a small glass bottle, an ordinary demi-bouteille in fact; the waiter then provided me with a ham sandwich, and, with my scrip thus frugally furnished, I thought the heights of Monte Rosa might be won..." After encountering a party of climbers guided