ww1 fortification in val pontebbana, north east italy

italy europe february winter snow landscape mountains alps alpine friuli friulivenezia giulia venezia countryside rural travel tourism hills trees mountainous dolomites window embrasure world war fortification bunker position fortified walls protection defence wartime stronghold entrenchment 1st defensive conflict udine pontebba val pontebbana chain link chainlink mesh slope net netting rockfall landslides safeguard european union eu country outside outdoors outdoor north east south northern eastern southern nature snowy season seasonal valley deciduous bare snowfall brown