Ask HN: I'm trying to find a paper about medieval spending on warfare

Hi Guys,

I'm trying to find an article about medieval european warfare spending. I kinda remember it being posted to HN (but the only thing I remember was that war accounted to sth along 90% of 'state' budget). I'm trying googling and duckduckgoing it but to no avail.

Anyone remembers this paper/article? or have some suggestions on better searching methods?