The stop line of which R15 post forms part, originally had incorporated the posts L53, R12, No.4 Platoon and Battalion HQ at Villa Freibusa and later R13 & 14 posts that flank Fort Mosta. Initially, this line was manned by troops from HQ Coy 2nd Battalion Royal Irish Fusiliers, but eventually these were replaced by men from the 2 Battalion Kings Own Malta Regiment. Land for the building of this post was obtained by the military from the Civil Government on encroachment basis in September 1939 on payment of one shilling per annum.
 
War Time Role
The role of R15 post was that of covering with its machinegun, rifle and anti-tank fire the anti tank ditch & wall (VX6) located at GR407297 half way down the T’Alla w Ommhu Hill towards Salini, already in place  by July 30, 1940.  A temporary bridge spanned this ditch to allow vehicular traffic to pass under normal conditions, but in case of emergency this was to be blown up on orders of the Commander of the Pembroke Sector. This post was also meant to cover with its fire the T’Alla w Ommhu road. During the war this road was partially blocked with concrete blocks to slow down the traffic. According to Operation Order No.12 dated 27 Jan 1940, this post formed part of the Wardia Infantry Battalion Sector during which time it was not to be permanently manned.
 
 At the time Malta had been divided into three main Infantry Brigade Sectors: North, South and Central. Each of these sectors was in turn divided into Infantry Battalion Sectors with each sector being divided into three sectors. Infantry Battalion sectors were then sub-divided into Infantry Company Sectors with these sectors divided again into Platoon Sectors. Each platoon Sector was formed from a number of defence posts each of which would be manned by a Section of infantrymen under the command of an junior NCO.
 
With the entry of Italy into the war on the side of the axis, in May 1940, imminent invasion was expected. Hence, the entire garrison was put on alert for the first weeks till the scare gradually subsided when it became evident that Italy was not, after all, so keen to capture Malta. It was at about this time that R15 post had a garrison allotted to it on a permanent basis. Also at the same time, it was transferred from its present sector to the Pembroke Infantry Battalion Sector. On 7 August 1940, this post was transferred to the Ta’ Kali Company with the rest of the posts along the stop line, but it still remained within the Northern Infantry Brigade.
 
Armament
The armament of this post consisted of one .303” Bren light machinegun, one .303” Lewis light machinegun and one .55” Boys Anti-Tank rifle. One of the machineguns was to be mounted outside of the post in an open stone sangar for use against low flying aircraft. In addition, the garrison of this post were issued with Marks 68 and 73 A/Tk hand grenades and a Verey Light pistol.
 
Design and construction
This post is built on two floors measuring some 16 x 16 feet. Its cubic form represents one of three roughly standardised patterns adopted for the building of defence posts in Malta. It has four corner gun ports for machine guns at the top floor level and eight small rifle slits, four at each level positioned roughly at the centre of each face. It also has a boxlike observation cupola meant to protect anyone standing in it from flying splinters and small arms fire. Access into the post could be gained either from a small two door metal shutter at the back of the posts or from a trap door on top of the cupola.
 
The maximum thickness of the reinforced concrete walls is 12 inches which was standard for all defence posts built by the British in Malta at the time. This was designed to withstand the effects of small arms fire and light artillery shot up to a 3 inches of calibre.
 
The roof is supported by four square sectioned columns that extend the full length of the floors and by heavy concrete cast beams that also serve to block stray bullets entering the main gun ports from bouncing and ricocheting inside the post. A blast wall built from rubble stone and positioned in front of the main entrance into the post also served for the same purpose.Access between the two floors and the observation cupola was via an iron ladder. The top floor served as the main combat platform, whilst the lower floor was the living quarters of the garrison.  Originally, the R15 post was camouflaged to represent a typical Maltese rural building with stonework and apertures painted directly onto the concrete faces.
 
Fatality
On April 28, 1941, at around 19.00hrs, an aerial bomb fell next to the post and killed two of its garrison; 6977994 Lance Corporal Watton and 6978783 Fusilier Hawkins. Both men were from the 2 Battalion Royal Irish Fusiliers. This fatal incident is still marked today by the splinter marks from the exploding bomb on two of the outer faces of the post.
 
Restoration
In 1996, volunteers from Fondazzjoni Wirt Artna - the Malta Heritage Foundation in collaboration with the Naxxar Local Council, undertook the restoration of this post in an effort to increase public appreciation of our wartime heritage.