A northern pincer invaded Attack Portugal from Galicia crossing Motion_directional the Douro and threatening Warning Porto while the southern force crossed Motion_directional the border from Ciudad Rodrigo and preceded Process_start towards the major Portuguese fortification of Almeida .

the germans began Process_start systematic fortification of the area , according to a directive from erich von falkenhayn the german army chief of staff , to fortify the western front so that a small number of infantry could defend Defending the front indefinitely and later in the year began Process_start work on second and third defensive positions but in the somme area , the defences north of the unk were improved Cause_to_make_progress first and by july 1916 the first position defences around mametz were extensive but the second position was a shallow trench and the third position had only been marked Recording out .

German fortification of the area around Mametz and Fricourt had created Creating a web of trenches deep behind the front-line trench , which was irregular making many angles from which an attacker could be engaged .

The Spanish `` presidio '' was the main fortification Defending in Bougie , occupied Control by about 100 men under Luis Peralta , and then his son Alonso Peralta .

By late December , the completed Process_end Austrian batteries connected Connect with the captured Arrest French fortification called Statement `` Bonnet de Prêtre '' ; from these positions , the Austrians bombarded Attack the French defenses Defending with enfilade fire .

Hawthorn Ridge Redoubt was a German front-line fortification Defending , west of the village of Beaumont Hamel on the Somme .

Fort Bowyer was a short-lived earthen and stockade fortification that the United States Army erected Building in 1813 on Mobile Point , near the mouth of Mobile Bay in what is now Baldwin County , Alabama , but then was part of the Mississippi Territory .

Between 1819 and 1834 the United States built Building a new masonry fortification , Fort Morgan , on the site of Fort Bowyer .

A prolonged passage of Curacao resulted in Causation the damaging Damaging of the harbor fortification .

There have been at least eight sieges Besieging of Stirling Castle , a strategically important fortification in Stirling , Scotland .