The ground between the hills and the marshy valley of the Danube forms a defile through which the main road from DonauwOrth led to Ulm; parallel streams divide the narrow plain into strips.
In the west Khurshid's lieutenant, Omar Vrioni (a Mussulman Greek of the race of the Palaeologi), had inflicted a series of defeats on the insurgents, recaptured Levadia, and on the 30th of June relieved the Acropolis; but the rout of the troops which Mahommed Pasha was bringing to his aid by the Greeks in the defile of Mount Oeta, and the news of the fall of Tripolitsa, forced him to retreat, and the campaign of 1821 ended with the retirement of the Turks into Thessaly.
Wellesley meant to turn the defile of Torres Vedras by Mafra at once if possible; but on this night Sir Harry Burrard, his senior, arrived off Vimiera, and though he did not land, gave instructions to wait for Sir John Moore.
The only river communication with foreign countries is furnished by the Danube, on the one hand towards Austria and Germany, and on the other towards the Black Sea, All the rivers belong to the watershed of the Danube, with the exception of the Poprad in the north, which as an affluent of the Dunajec flows into the Vistula, and of a few small streams near the Adriatic. The Danube enters Hungary through the narrow defile called the Porta Hungarica at Deveny near Pressburg, and after a course of 585'.m.
The road descends past the Swiss village of Simplon, and passes through the wonderful rock defile of Gondo before entering Italy at Iselle (28 m.
Here the river runs in a narrow precipitous defile along which no path is practicable.
Separated from the Jura by the defile of Belfort (Troue de Belfort) the Vosges extend northward parallel to the course of the Rhine.
That night the mine-fields at the mouth of the Dardanelles were cleared away, and battleships were in consequence enabled to penetrate into the lowest reaches of the defile on the morrow.
This done, the formidable Pentepigadia defile was attacked, and after four days' fighting cleared (Nov.
Between Capua and Beneventum, a distance of 32 m., the road passed near the defile of Caudium (see Caudine Forks).