Hello David!
thank you for your kind reply. Well... Carroccio is a symbol of the Italian Communal age, on the battlefield it represented the city itself . It was a typical wagon of the "city-state" as Florence, Pisa, Siena, Milan, Pavia and other cities of the center/north Italy. When in the14th century the communal (munucipal) system started to have a crisis and Dukes and Lords expanded they territories building Dukedoms and lordships using mercenaries, the Carroccio Wagon disappeared.
About the last Pisa carroccio you can take a look at: Anonymous (1330; in Rerum Italicarum Scriptores, book XI)
Easy sources are from Wikipedia:
https://en.wikipedia.org/wiki/Carroccio
"14th century: decay and disappearance
The decadence of the Carroccio occurred due to the evolution of war tactics. When larger and more manoeuvrable armies began to appear, the municipal infantry were replaced by soldiers of "ventura", who, being mercenaries, lacked emotional ties and belonging to the city. The symbolic value of the Carroccio, in this historical context, was therefore less.[9] Moreover, from a logistical point of view, the Carroccio, being a very slow vehicle drawn by oxen, was not very mobile, and often created obstacles to the actions of war, which were becoming faster and faster.[9] For these reasons, the Carroccio, in the 14th century, went inexorably towards a phase of decadence which then led to its disappearance from the battlefields."
There are no mentions in late medieval battles about Carroccio.
About the oval/round shield and spear troops we have tons of chronicles and pics, some sources are:
http://stemmieimprese.it/2011/08/03/%E2 ... 9araldica/
https://it.wikipedia.org/wiki/Battaglia ... li)_03.jpg
https://it.wikipedia.org/wiki/Battaglia ... is)_01.jpg
https://legaitalica1454.org/2019/08/04/ ... riosita-2/
https://legaitalica1454.org/2015/07/08/ ... de-basini/
http://bibliotecaestense.beniculturali. ... x.2.14.pdf
https://www.google.com/search?q=rotelle ... 23&bih=690
They were basically soldiers equipped with:
Sallet or Barbuta Helmet
oval or round shield
light padded doublet
spear as main weapon
sword, dagger or falchion used as secondary arm in closer combat
sometimes they wore greaves and breastplate and a javelin too
i think they are light spears but the better equipped ones could be raiders maybe...
they were a fast and mobile open order infantry, but sometimes it is possible to see them in close order as communal spearmen or like pavesarii defending crossbowmen.
another kind of similar infantry were the "lanzelonghe" (longspears) they carried two hands longer spears, (but not really pikes) and no shields, but usually breastplate.
All the best!
Leonerampante