male Swallow displays

I assume that all of these Swallows are males from the length of the tail streamers and that these were display / fight flights accompanied by rapid calling and vertical chases -- difficult to capture so no excuses for the lack of quality in the images but the poses were of interest; lots of Swallows this am with 50 in one bush as I biked past but when I returned with the camera they had needless to say dispersed; several birds with real rich orangy underparts - where do these birds breed or come from? they seem to be a feature of mid April Swallow arrivals