The emplacement of igneous intrusions tends to deform the surrounding country rock. Seafloor topography plays some role in accretion, especially emplacement of igneous crust. These methods can also be used to determine ages of pluton emplacement. A casemate is a fortified gun emplacement or armored structure from which guns are fired. Adoo continued to advance upon both the BATT house and the artillery emplacement. Mars also has an atmosphere that plays a role in ejecta emplacement and subsequent erosion. Every fortification, artillery emplacement and AA battery was carefully noted and scrutinised. After a bivouac on the actual Marinelli hut emplacement, they headed towards the Grenzsattel. The barracks for the battery were located near the southernmost battery emplacement. Formerly it used the fixed emplacement BL-64 "Bloodhound" missile system. The park was home to a barrage balloon anchorage and an ackack emplacement. Craven claimed the destruction of one gun emplacement. After the emplacement and the retrievability period, drillholes would be backfilled and sealed. Misleading the enemy as to the strength of an emplacement was an effective delaying tactic. The tubes are infilled due to the low slope angle of emplacement.