We 've had a change of tack & returned to Ancients.  We've also had a change of rules.  A few people mentioned how well Basic Impetus flows, so.....  A Marian Roman versus Gauls, Basic Impetus 2.0 rules.  Our first game, a few niggles but we got most of the rules covered.
Every unit has 'VBU' which is your strength, it gets reduced after losses. Impetus 'I', which is a bonus when you charge into combat, only when the unit is fresh.  'VD'  is the points value of the unit.  I ordered a set of the version 2.0 rules 
(they hadn't arrived for our 1st game) from the authors & a copy of the PDF.  We never played the 1st version of Basic Impetus, but I recall downloading a 'free' version so printed these out & used them for reference.  Switching between the PDF on my mobile & the paper rules, we cracked on.
On paper the Army size doesn't look very big, however once they are on the table it's a different matter.  'Looks wise' it's similar like to 'Big Base DBA'.  Spav went with the hairy Gauls, choosing not to have any options.  Yours truly went with the mighty Romans.  I swapped out 2 'standard' Legionary units for 2 'weaker' ones BUT with an additional Auxiliary unit.  My thinking was an extra Javelin equipped unit to shoot the Big Gallic units.
6.1 Marian Roman 105-25 BC
Italians, Gauls, Spanish 1xCM VBU=5, I=2, VD=2
Numidian, Spanish, Thracian, Illyrian 1xCL VBU=3, I=1, VD=1, Javelin
Legionaries 4xFP* VBU=6, I=2, VD=3, Pilum
Spanish, Illyrian, Ligurian Auxilliaries 1xFL VBU=4, I=1, VD=2, Javelin
Rhaetian, Thracian Auxilliaries 1xFL VBU=4, I=2, VD=2, Javelin
Auxiliary Javelinmen 1xS VBU=2, I=0, VD=1, Javelin
2nd option: change 2 Legionaries FP with 
                    Raw Legionaries 2xFP* VBU=5, I=1, VD=3, Pilum
                    Spanish, Illyrian, Ligurian auxiliares 1xFL VBU=4, I=1, VD=2, Javelin
5.5 Gauls 400-50 BC
Chariots 1xCGL* VBU=5, I=1, VD=3, Various
Cavalry 1xCM* VBU=5, I=2, VD=2
Soldurii Elite 1xFP* VBU=6, I=4, VD=3, Impetuous
Warriors 1xFL* VBU=5, I=4, VD=3, Impetuous
Warriors 5xFL* VBU=4, I=4, VD=2, Impetuous
Javelinmen 2xS VBU=2, I=0, VD=1, Javelin
Archers 1xS VBU=2, I=0, VD=1, Short bow B
Warriors can form Large Units.
  | 
The Battlefield. 
Cavalry on the wings, 'footsloggers 'in the middle. | 
  | 
| RRRAAARRGGH, the Gallic Horde, 3 large Warrior units. | 
  | 
| I decided to place 3 Roman Legionaires in the front line, one unit in reserve to 'plug' the gap after the Gallic Warriors would inevitably cause damage. | 
  | 
| Numidian Light Cavalry & Spanish Light troops would attack on one flank. | 
  | 
| A slight advantage to the Romans on the other flank, both having Cavalry & Light Infantry. | 
  | 
| Greek javelin throwers supported by Roman Cavalry | 
  | 
| Strangely... Spav holds the Gallic Chariots in check for the 1st round. | 
  | 
| Gallic Cavalry & Skirmishers | 
  | 
The Spanish Light Infantry would pour javelins into the advancing Gallic horde. 
 Hopefully causing a few injuries before they smack into the Legionaries. | 
  | 
| The troops face of against each other on the flank, javelins abound! | 
  | 
Eeeerrr, the Spanish Light Infantry screen isn't working. 
The 'explosive' marker is used to signify a unit is 'Disordered'. | 
  | 
| Please just one hit from the Spanish javelins.... | 
  | 
| Please, Please, Please just one hit from the Spanish javelins.... | 
  | 
'They're off!' Spav's Gallic Charioteers advance 
The Gallic Skirmishers block the Roman attack. | 
  | 
'CHARGE'  the Gallic Cavalry charge in, loads of dice plus their Impetus bonus... 
However, Spav's die rolls are pants! | 
  | 
| Legionaries carry Pilums, in Basic Impetus they are allowed a number of dice to throw before the Gallic attack goes in | 
  | 
| The Romans win initiative this round, the Numidians go for the flank | 
  | 
| 'CHARGE!' The Roman Cavalry pile into the melee, multiple unit combat are a big part of Basic Impetus. | 
  | 
'BOOM!' 'BANG!' WALLOP!' 
The Gauls smash into the Roman Line. | 
  | 
| The Gallic Chariots race off around the battlefield... | 
  | 
First Blood to the Romans. 
In Basic Impetus you roll to hit, then the unit must face a cohesion test with a number of modifiers. 
If you fail this, the number you fail it by are your casualties.... | 
  | 
| A Roman unit looses this combat & is forced to retire, the Gauls as 'Impetuous' would pursue. | 
  | 
| The Gauls pursue, catch the Romans, trigger another melee and destroy them. | 
  | 
| In the centre, the Gauls are forced to retreat. | 
  | 
| A mixed bag of results, 'evens' I think. | 
  | 
| This melee went on for ages, sometimes no matter how many dice you roll, you still can't get a 5 or a 6. | 
  | 
| Another round, I decide to advance the centre Romans & trust the rear unit would dealing with the outflanking Gauls.  | 
  | 
| The Spanish Light Infantry attack the Gallic Skirmishers holding the marsh. | 
  | 
| A mighty scrap.... | 
  | 
| More success for the Romans. | 
  | 
| Still fighting..... | 
  | 
| Spav spies an opportunity.... | 
  | 
| The Gallic Heavy Infantry are stranded, left to chase the Numdians... | 
  | 
Love it!  The troops look great. 
The combats in Basic Impetus work really well. | 
  | 
| 'BOOM!'  Another Gallic Warrior Unit is put to the sword. | 
  | 
Combat Overview. 
It's pitched battle everywhere. | 
  | 
| The Romans win the initiative this round as well. | 
  | 
'Steady the line!' 
The micro die represents the current VDU of the unit = 2. | 
  | 
| Queue the 'Benny Hill' music as the Numidians chase the Chariots around the Battlefield | 
  | 
| Spav 'fist pumps' the air, another legionary Unit is destroyed... | 
  | 
| They can't advance as they are in contact with the other Legionaries | 
  | 
| Oh yes, the Gallic Cavalry are finally destroyed, the flank is open! | 
  | 
| The Gallic Warriors attack the Roman reserves. | 
  | 
| Spav's pinning his hopes on this one, the Gallic Chariots pile in and.... | 
  | 
...rolls rubbish dice. 
They retreat in shame...Hang your head my son! | 
  | 
Vicitory is near, The Gallic Warriors take losses. 
In Basic Impetus, certain troop types can form 'Large Units', losses are taken from the rear most unit.  | 
  | 
| Another round & they are put to the sword. | 
  | 
| It's two units against two now in the centre... | 
  | 
The Greeks Light Infantry turn to face the Gallic Chariots... 
Those Gallic Skirmishers look mighty tasty to the Roman Cavalry | 
  | 
The other flank is a sideshow, not much happening. 
Spav wasted the Gallic Heavy Infantry by deploying them there. | 
  | 
GAME OVER! 
Javelins fly in & destroy the Gallic Chariots... | 
"SUPERB! BRILLIANT! FANTASTIC! OMG!"  -- 
SPAV April 2018
Our first game of Basic Impetus 2.0 & it was very good.  The combat system is brilliant, once you get your head around it, works very well.   It can be brutal as well, a combat can go on if your unit advances & comes into contact with another enemy unit. Initiative plays a big factor, you roll to see who goes first, sometimes you may have 2 turns in a row.   For this game, we didn't play the ACE IN THE HOLE'  a set of special rules giving advantage to either side.  Anyway a big thumbs up , we would recommend playing.
A big 'Thank You' to two 'You Tube' Vloggers (I think they are called).  I eagerly watched videos from both authors & they helped a great deal in learning the Basic Impetus Rules.  
(Perhaps all Wargame Companies should take note & produce videos on learning the rules they create)?
TAFFEKLES - Ross FigurePaintingCoUK
https://www.youtube.com/playlist?list=PLluuTES57aoNPypyvR5N9J2Z7sBiqSRvL
A Dash Of Elan Wargaming
https://www.youtube.com/watch?v=W7oCf3JeKZM&list=PLDXX1Xs-oSbXFqt9lAd706sPcC0id9QY0
I was in the process of selling all my DBA armies as I couldn't see when I would use them again.  Guess what, I'm now in the process of creating Basic Impetus 2.0 Armies...