Yes combat darts. this was very popular side weapon in the late roman army and early Middle ages.Also relatively many archeological finds are preserved for us.
Some Roman units were especially distinguished for using them.Soldiers usually have five of them installed on the inner side of the shield or in a quiver at the belt.Romans called it Plumbatae(lead-weighted darts) or martiobarbuli(little barbs of Mars).
Boots:there are many reenactment groups dealing with this period whose photos I often use as base for many of my ilustrations like in this case.But I also use books about roman army and its equipment,really lot of books is devoted to this.The best acessible are those from osprey publishing especially three books series about roman military cloathing by Graham Sumner and Raffaele D'Amato and Graham Sumners expansion of these books in Roman military dress book. Apart from these you could also see 4th cent.boots depicted on numerous contemporary pictures although,of course,you must be carefull by using this source.